Urban coyotes are thriving in cities, but not for the reasons one might expect. A recent study reveals that human-related factors, rather than access to natural habitats, have a stronger impact on their survival.&nbsp;



Researchers tracking coyotes in Chicago discovered that densely populated <a href="https://www.earth.com/news/city-living-causes-chronic-stress-for-some-coyotes/" target="_blank" rel="noreferrer noopener">human areas</a> are linked to longer coyote lifespans, overturning the conventional belief that wildlife fares better in more natural settings.



<h2 class="wp-block-heading" id="h-human-presence-plays-a-surprising-role">Human presence plays a surprising role</h2>



“What we found was really interesting, in that the societal characteristics seem to play a much more important role in predicting coyote survival time than the environmental characteristics,” said Emily Zepeda, the study’s lead author and a postdoctoral scholar at <a href="https://www.osu.edu/" target="_blank" rel="noreferrer noopener">The Ohio State University</a>.&nbsp;



“And then we found this positive effect of human population density on survival time. Both of those things are unexpected because we usually associate human activity with detrimental effects on wildlife.”



<h2 class="wp-block-heading" id="h-the-urban-coyote-research-project">The Urban Coyote Research Project</h2>



The study, recently published in the journal <a href="http://dx.doi.org/10.1007/s11252-024-01643-w" target="_blank" rel="noreferrer noopener">Urban Ecosystems</a>, stems from the Urban Coyote Research Project, a long-term study of coyote ecology in the Chicago Metropolitan Area.&nbsp;



This research, led by wildlife ecologist Stan Gehrt, has monitored the behavior and ecology of Chicago’s estimated 4,000 coyotes, offering rare insights into how they adapt to urban life.



<h2 class="wp-block-heading" id="h-tracking-coyote-survival">Tracking coyote survival</h2>



For this study, researchers analyzed movement data from 214 coyotes tracked between 2013 and 2021. Using the length of time each coyote was monitored as a proxy for survival, they evaluated societal and environmental factors such as neighborhood income, human density, road density, and proximity to parks.



The findings revealed that human population density positively influenced coyote survival. Coyotes in areas with low human density tended to have shorter lifespans, while those in densely populated areas lived longer. Interestingly, the interaction between income and density also played a role.&nbsp;



In low-density areas, income had little effect on survival, likely due to the lack of human presence. However, in moderate- to high-density neighborhoods, coyotes in lower-income areas were 1.5 times more likely to survive to age two than those in wealthier areas.



<h2 class="wp-block-heading" id="h-resources-and-competition-in-urban-settings">Resources and competition in urban settings</h2>



The researchers theorize that higher human population density provides urban coyotes with essential resources like food and shelter, helping them endure harsh conditions such as Chicago winters.&nbsp;



“We’ve hypothesized that population density may have a positive effect because it’s actually providing resources like human-related structures or food that allow coyotes to weather the harsh conditions of the winter, which is a major mortality factor for Chicago coyotes,” Zepeda explained.



However, these benefits may come at a cost in higher-income areas, where vegetation and better waste management can attract more coyotes, leading to increased competition and disease transmission.&nbsp;



“There might be more individuals in those areas, but survival time may be shorter there,” Zepeda said. “You might die younger in an area where there are a lot of competitors.”



<h2 class="wp-block-heading" id="h-adaptability-of-coyotes">Adaptability of coyotes</h2>



Surprisingly, the study found no significant link between <a href="https://www.earth.com/news/most-species-are-shifting-their-habitats-due-to-climate-change/" target="_blank" rel="noreferrer noopener">natural habitats</a> and coyote survival. Parks and nature preserves, often assumed to be ideal environments for coyotes, did not seem to offer a survival advantage.&nbsp;



“Anecdotally, we see really high densities of coyotes in nature preserves and urban parks. That’s often where you see coyotes in the city if you see them at all,” Zepeda said.



The researchers speculate that this finding could result from a variety of factors, including limitations in how habitat types are classified on city maps or more frequent hunting and trapping in natural areas.&nbsp;



Alternatively, it may highlight the adaptability of coyotes, which seem capable of thriving in urbanized environments despite their preference for natural habitats.&nbsp;



“It could speak to how adaptable they are that they might prefer natural habitat, but at least in terms of survival, they can do just as well in more urbanized areas,” Zepeda added.



<h2 class="wp-block-heading" id="h-societal-factors-and-urban-ecosystems">Societal factors and urban ecosystems</h2>



This study adds to growing evidence that societal factors affecting human populations also influence <a href="https://www.earth.com/news/urban-biodiversity-is-not-a-luxury-it-is-attainable-for-everyone/" target="_blank" rel="noreferrer noopener">urban ecosystems</a>. The presence or absence of humans, combined with the conditions in which they live, may overshadow natural influences on wildlife survival.&nbsp;



Gehrt’s long-term research emphasizes the importance of understanding these dynamics as urban areas expand.



As urban ecosystems continue to evolve, studies like this provide critical insights into how wildlife interacts with human populations.&nbsp;



Further research could explore specific societal factors - such as waste management practices or public attitudes toward coyotes - and their influence on urban <a href="https://www.earth.com/news/un-report-disturbing-details-about-the-state-of-earths-wildlife/" target="_blank" rel="noreferrer noopener">wildlife</a>.



By better understanding these relationships, cities can develop strategies to foster coexistence between humans and animals, creating urban environments where both can thrive.



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Coyotes live longer in densely populated human areas

Urban coyotes are thriving in cities, but not for the reasons one might expect. A recent study reveals that human-related factors, rather than access to natural habitats, have a stronger impact on their survival.&nbsp; Researchers tracking coyotes in Chicago discovered that densely populated human areas are linked to longer coyote lifespans, overturning the conventional belief that wildlife fares better in more natural settings. Human presence plays a surprising role “What we found was really interesting, in that the societal characteristics seem to play a much more important...

Scientists solve mystery of beached whale in Namibia. A rotting carcass recently discovered on the coastline of Dorob National Park in Namibia at first had scientists puzzled. It was not clear what species the animal belonged to due to the badly decomposed state of the body. 

However, it is now believed to be the remains of a Cuvier’s beaked whale. 

Cuvier’s are one of the <a href="https://www.fisheries.noaa.gov/species/cuviers-beaked-whale">most commonly spotted</a> beaked whales and there are thought to be over 100,000 Cuvier’s in the ocean. 

The whales are known for their <a href="https://www.earth.com/news/beaked-whales-dive-deeper/">deep dives</a> and they can swim down to depths of 9,816 feet, the deepest dive of any mammal on Earth.

Cuvier’s have a long torpedo-like body with a head that curves into a short beak. Also the Scientists solve mystery of beached whale in Namibia 

The carcass was in such bad shape that scientists, besides at first being unable to identify it, are also not able to determine any cause of death. Samples of the whale have been collected and will be analyzed for further research. 

“The body of this animal was in an advanced state of decomposition - making it look rather un-whale like and there were several confused reports on social media,” Simon Elwen, a researcher from the <a href="http://www.namibiandolphinproject.org/">Namibian Dolphin Project </a>(NDP) told the <a href="http://www.dailymail.co.uk/">Daily Mail</a>. “However, based on the shape of the head and snout and the overall size - research team are fairly confident that the specimen is a Cuvier's beaked whale.” 

Despite their large numbers and widespread distribution, the whales are rarely seen except at lower depths, so having one wash ashore just added to its mystery. 

“I was quite surprised. These animals are rarely seen in the water, so to see them on land is very unique,” Elwen told the Daily Mail.

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>,<a href="https://www.earth.com/"> Earth.com</a> Staff Writer 

Image Credit: Caters News Agency

Scientists solve mystery of beached whale in Namibia

Scientists solve mystery of beached whale in Namibia. A rotting...

Fossil reveals early tetrapods lived within the Antarctic Circle.  Long before the Mesozoic Era, the age of the dinosaurs, the Paleozoic Era saw <a href="https://www.earth.com/news/uncovering-the-secrets-of-coral-evolution/">an abundance of life</a> like never before. It was during this time that fish first began to evolve into tetrapods, four-legged animals that could walk on land. 

Tetrapods are thought to have first evolved during the Devonian period, “<a href="https://www.britannica.com/science/Devonian-Period">the age of fishes</a>,” 360 million years ago and previous fossil evidence has led researchers to believe they evolved and existed primarily in tropical regions. 

However, a remarkable new finding shows that tetrapods were widespread, and even inhabited the Antarctic Circle. 

Researchers from the <a href="https://www.wits.ac.za/">University of the Witwatersrand</a> and the <a href="http://www.am.org.za/">Albany Museum in Grahamstown </a>in South Africa examined the Devonian Waterloo Farm locality and found tetrapod fossils. 

The Farm locality is a roadcut that exposed dark grey mudstones rich with Devonian fossils of animals and plants. 

Two new tetrapod species were identified in the Devonian locality, the Tutusius, and Umzantsia, and they the earliest known four-legged vertebrates ever to exist in Africa. The find also calls into question previous theories about where tetrapods evolved and lived. 

“Whereas all previously found Devonian tetrapods came from localities which were in tropical regions during the Devonian, these specimens lived within the Antarctic circle,” said Robert Gess, the lead author of the study. 

The new tetrapods are discussed in a report published in the journal Science and are the first tetrapods ever found to have existed outside of tropical regions. 

During the Devonian period, North America, Greenland, and Europe formed a single landmass called Laurissa. It was thought that in Laurissa, in the paleotropics, tetrapods evolved because that’s where their fossils were found. 

Meanwhile, Africa, South America, Australia, Antarctica, and India were part of a supercontinent called Gondwana during the Devonian period, but almost no fossil evidence of tetrapods have been found in this expansive area. 

Tutusius and Umzantsia though are now the first tetrapod fossils not only found outside of the tropics in Gondwana but within Antarctic circle. 

The find challenges the theory that tetrapods only evolved in tropic regions and instead shows that tetrapods were located all over the world in the Late Devonian. 

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

Image Credit: Maggie Newman

Fossil reveals early tetrapods lived within the Antarctic Circle

Fossil reveals early tetrapods lived within the Antarctic Circle.  Long...

Male vervet monkeys attack their group members to break up fights. A team of anthropologists at the <a href="http://www.uzh.ch/en.html">University of Zurich</a> have found that male vervet monkeys attack members of their own group in order to prevent the escalation of fights. The females, on the other hand, encourage the males to fight.

“We have recently shown that females in this species use both aggression as punishment and grooming as reward to manipulate the participation of male group members during intergroup fights,” said study lead author Erik Willems.

Many years of research have demonstrated that cooperative activities are common among social species. Groups of animals are known to hunt and share food, help raise offspring, keep watches to warn others of predators, and to team up in fights.

Because these social groups contain unique individuals, the benefits or costs of cooperation are different for each member of a group, which means that there is often disagreement during cooperative activities.

Engaging in intergroup fighting is risky and can lead to serious injury or even death, but victory can lead to valuable resources.

Study first author Jean Arseneau-Robar conducted her doctoral research at the <a href="https://www.unine.ch/compcog/en/home/projets-de-recherche/ivp.html">Inkawu Vervet Project</a> in South Africa.

“It has always been assumed that males exhibiting this behavior want to prevent females from mating with males in the opposing group,” said Arseneau-Robar. “These acts of male aggression have thus always been interpreted as acts of mate defense.”

The research team observed male <a href="https://www.earth.com/news/monkeys-friends-health-survival-odds/">monkeys</a> attacking other male members of their own groups during intergroup fights. However, the male monkeys did not intervene or become aggressive when females were seen interacting or mating with males from other groups.

The attention of the males was instead focused on others who were instigating or had been recently involved in fights. According to the experts, male vervet monkeys often use punishment and coercion to stop dangerous fights.

“It was really interesting to see that while females use punishment and rewards to try and rally the troops, males actually use punishment and coercion to try and stifle the fighting, effectively keeping things calm and safe for small, vulnerable infants,” said study co-author Professor Carel van Schaik.


The research is published in the <a href="http://rspb.royalsocietypublishing.org/">Proceedings of the Royal Society B</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Male vervet monkeys attack their group members to break up fights

Male vervet monkeys attack their group members to break up...

Giraffe death calls into question zoo conditions and regulations. Zoos allow people to stand some mere feet away from wild animals they likely would have never encountered otherwise. While zoos can provide a once-in-a-lifetime experience for visitors, they can be harmful and potentially fatal for the animals they showcase.

Just last month, a giraffe died at the Lisbon Zoo while trying to reach for food from a visitor. The giraffe fell into a moat in its enclosure that was meant to separate the animals from the visitors. The 11-year-old female giraffe had made headlines last year after giving birth at the zoo.

Now the giraffe is in the news again, illustrating the risks of allowing humans and wildlife to interact so closely. Although there was a “Do Not Feed the Animals” sign next to the giraffe’s exhibit, the visitor still enticed the giraffe towards the moat with food.Giraffe death calls into question zoo conditions and regulations

In a statement, the zoo stated that the visitor who tried to feed the <a href="https://www.earth.com/news/giraffes-long-necks/">giraffe</a> has been identified by area police who are looking into the case.

A necropsy revealed that the giraffe died from cardio-respiratory failure as a result of its fall into the moat.

The giraffe’s baby will require additional care from the zoo staff to ensure its survival. Baby giraffes are dependent on their mothers, especially babies like the one at the Lisbon Zoo who are less than one year old.

According to<a href="http://www.animalplanet.com/tv-shows/giraffe-birth-live/frequently-asked-questions/"> Animal Planet</a>, giraffe’s nurse from their mothers for 9 to 12 months and stay with their mother for a few months after they are done weaning. Female giraffes will live in the same herd as their mother throughout adulthood.

This is not the first case of visitors causing the death of a wild animal. In May 2016, the story of a boy falling into a gorilla’s enclosure at the Cincinnati Zoo made national headlines. Zookeepers shot and killed the gorilla to protect the boy, who survived the incident.

In 2007, a Siberian tiger killed a teenage boy and injured two others after leaping from its cage at the San Francisco Zoo. Police officers shot and killed the tiger. Federal investigators believe the teenagers agitated and provoked the tiger, leading to the attack.

In a draft report for the <a href="https://www.usda.gov/">United States Department of Agriculture’s</a> Animal and Plant Health Inspection Service, tiger expert Laurie Gage wrote, “With my knowledge of tiger behavior I cannot imagine a tiger trying to jump out of its enclosure unless it was provoked.”

For wild animals, living in close proximity to human visitors can be stressful, even without the public directly interacting with the animals.

Research shows that the mere presence, sounds and smells of people can elicit a stress response in captive animals which can depreciate their overall welfare.

A 1988<a href="https://onlinelibrary.wiley.com/doi/pdf/10.1002/zoo.1430070407"> study</a> published in Zoo Biology showed that the presence of visitors made primates less social, more aggressive and more likely to display stereotypical behavior- repetitive movements usually associated with boredom or stress. Researchers were able to reduce the changes by 50% simply by making the visitors lower their height.

A more recent 2017<a href="http://rsos.royalsocietypublishing.org/content/4/4/161017"> study</a> published in Royal Society Open Science examined fecal glucocorticoid metabolites (fGC) in captive meerkats to assess the effect visitors had on the animals’ stress levels.

Glucocorticoids are often used to measure stress in zoo animals. The researchers state, “The main characteristic of the physiological stress response in vertebrates is the release of glucocorticoids (cortisol, corticosterone) from the adrenal gland in response to a stressor. Glucocorticoids play an essential role in general homeostasis, and their presence at elevated concentrations can also indicate a stress response, as one of their functions is to trigger the mobilization of energy stores to allow the animal to respond to the current threat.”

The researchers found that fGC levels increased the day after a large number of people visited the meerkat exhibit. Meerkats who were visited by a low number of individuals did not have similar spikes in their fGC levels.

While not all human-wildlife interactions at zoos result in the death of an animal, it is still important to note the potential adverse effects of captivity.

Zoos can take steps to make life for these animals less stressful. For example, the researchers found that meerkats had lower levels of stress when they were housed in larger groups. Additionally, visitors should always use caution when interacting with and observing wild animals. Keeping in mind the welfare of captive animals can help prevent harmful interactions.

--

By <a href="mailto:brianna.grant134@gmail.com">Brianna Lynne</a>, <a href="http://earth.com">Earth.com</a> Contributing Writer

Giraffe death calls into question zoo conditions and regulations

Giraffe death calls into question zoo conditions and regulations. Zoos...

Two new species of ancient saber-toothed predators discovered.  Scientists led by the <a href="http://naturalsciences.org/">North Carolina Museum of Natural Sciences</a> have described two new species of saber-toothed prehistoric predators. The fossils are providing new insight into the early evolution of mammals, which was a time when the role of some carnivores drastically changed.

During the Permian Period, millions of years before the earliest <a href="https://www.earth.com/news/dinosaurs-asteroid-struck/">dinosaurs</a>, ancestors of today's mammals called therapsids dominated terrestrial ecosystems. The diverse creatures, referred to as “protomammals,” included tusked herbivores, burrowing insectivores, and saber-toothed predators. 

Most remains of Permian therapsids have been found in the Karoo Basin of South Africa. This South African record has provided scientists with invaluable evidence of the evolution of protomammals.

Therapsid fossils from outside of South Africa, however, are also extremely important because they can be used to examine whether events in the protomammal fossil record represent global or strictly regional evolutionary patterns.


Recent expeditions by the <a href="https://www.tripadvisor.com/Attraction_Review-g1380981-d6491475-Reviews-Vyatka_Paleontological_Museum-Kirov_Kirov_Oblast_Volga_District.html">Vyatka Paleontological Museum</a> have produced a collection of very well-preserved Permian fossils recovered near the town of Kotelnich in European Russia, including the remains of two previously unknown species of predatory protomammals.

 The first of the two new species, Gorynychus masyutinae, was a wolf-sized carnivore and the largest predator in the Kotelnich fauna. The second new species, Nochnitsa geminidens, was a smaller, long-snouted carnivore with needle-like teeth. 

The new species from Russia provide the first evidence that the turnover in predators after the mid-Permian extinction was worldwide and not unique to South Africa.


The mid-Permian mass extinction, which came about eight million years before the well-known and devastating end-Permian mass extinction, played a major role in driving protomammal evolution.

 In the late Permian ecosystems, the top predators were giant, saber-toothed gorgonopsians, while therocephalians were generally small insectivores. In mid-Permian ecosystems, however, these roles were reversed. The saber-toothed top predator Gorynychus was a therocephalian, and the only gorgonopsians during this time were much smaller animals.

“In between these extinctions, there was a complete flip-flop in what roles these carnivores were playing in their ecosystems - as if bears suddenly became weasel-sized and weasels became bear-sized in their place,” said study co-author Christian Kammerer. 

“Kotelnich is one of the most important localities worldwide for finding therapsid fossils - not only because they are amazingly complete and well-preserved there, but also because they provide an all-too-rare window into mammal ancestry in the Northern Hemisphere during the Permian.”

The study is published in the journal <a href="https://peerj.com/">PeerJ</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Matt Celeskey

Two new species of ancient saber-toothed predators discovered

Two new species of ancient saber-toothed predators discovered.  Scientists led...

New research reveals that whales mourn their dead. A new study suggests that we should add marine mammals to the list of animals that form such strong bonds with their herds, pods, and family that they grieve and mourn their dead. 

This trait has been witnessed in <a href="https://www.earth.com/news/african-elephants-recovering-poaching/">elephants</a>, giraffes, chimps and now seven species of whale and dolphin, according to a new study conducted by researchers from the<a href="http://www.dolphinbiology.org/areas.htm"> Dolphin Biology and Conservation at Oceancare</a> in Italy. 

The research was published in the journal Zoology. 

Some whales have been seen holding onto a dead calf for long stretches of time and now, the new study says that this is representative of grief. 

The animals are keeping vigil for their dead, even disregarding their own wellbeing and safety by protecting the dead calf, family member, or friend. 

It’s likely a stress response and emphasizes the strong bonds formed in groups, particularly between a mother and her calf, so much so that the mother has a hard time letting go if the calf dies. 

For the study, the researchers reviewed 78 reports of seven whale and dolphin species dealing with their dead and a majority of the documented events involved females taking care of their dead offspring. 

Mothers and sometimes fellow podmates were observed attending to the calf, carrying it, trying to keep the corpse afloat, and even attempting to revive the calf.New research reveals that whales mourn their dead 

This behavior is called postmortem attentive behavior (PAB) and the researchers found examples of PAB in 20 of the reports that were reviewed for the study. 

Many instances of PAB involved dolphins, and the researchers hypothesize that this is because dolphins have more brain mass than other aquatic mammals and are highly social. 

A few of the reports detailed accounts of adult males becoming aroused by a corpse of a podmate but not by calves. 

The study shows that aquatic mammals react to their dead the same way that many other species and even humans do. Whales and dolphins seem to grieve or mourn and have difficulty letting go if a calf dies. 

More research needs to be conducted to see if the animals truly are responding to the death of a loved one or responding to stress, but the patterns of the behavior documented undoubtedly shows some attachment to the corpse of a familiar animal. 

“We found it is very common, and [there is] a worldwide distribution of this behavior,” Melissa Reggente, the study’s co-author, told <a href="https://news.nationalgeographic.com/2016/07/whales-death-grief-animals-science/?beta=true">National Geographic</a>. “They are in pain and stressed. They know something is wrong.”

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

New research reveals that whales mourn their dead

New research reveals that whales mourn their dead. A new...

Intricate communication strategies seen in male dolphin alliances.  It’s a well-known fact in the marine biology community that male bottlenose dolphins sometimes form long-lasting cooperative alliances with each other. These alliances can last decades, and have been the subject of intense study for decades as well.

Now, a new study in <a href="https://www.cell.com/current-biology/home">Current Biology</a> puts together over 30 years of continuous research on this subject. Stephanie King, of the <a href="https://www.uwa.edu.au/">University of Western Australia</a>, and colleagues wanted to better understand the role that vocal communication plays in coordinating complex social behaviors – such as cooperation – in bottlenose <a href="https://www.earth.com/news/dolphins-decline-amazon/">dolphins</a>.

To assess the role of vocal signals, the researchers went to Shark Bay, Australia and recorded the dolphins’ vocalizations using underwater microphones. They then determined the individual vocal label used by individual males, and measured the similarity of those identity signals within and between alliances in order to determine whether males with stronger social relationships used vocal labels that were more alike. 

“We found that male bottlenose dolphins that form long-term cooperative partnerships or alliances with one another retain individual vocal labels, or ‘names,’ which allows them to recognize many different friends and rivals in their social network,” says King. “Our work shows that these ‘names’ help males keep track of their many different relationships: who are their friends, who are their friend’s friends, and who are their competitors.”

The researchers wanted to know if allied dolphins shared similar calls as a way to advertise their alliance, or if they stuck to individual vocal labels. Analysis determined that males in an alliance kept their distinct vocal labels, which suggests that these calls may serve a purpose similar to an individual name. This finding is in contrast to other species, whose individuals with close relationships converge on shared vocalizations in order to advertise their alliance to that partnership or group.

“With male bottlenose dolphins, it’s the opposite – each male retains a unique call, even though they develop incredibly strong bonds with one another,” King explains. “Therefore, retaining individual ‘names’ is more important than sharing calls for male dolphins, allowing them to keep track of or maintain a fascinating social network of cooperative relationships.”

The researchers are planning to further study male dolphins’ relationships with one another more closely. They plan on playing the “names” of individual males back to each other and seeing how males respond to members of their alliances in different contexts. “It will be interesting to reveal whether all cooperative relationships within alliances are equal or not,” says King.

--

By <a href="mailto:certz@earth.com">Connor Ertz</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: Simon J Allen at the Dolphin Alliance Project

Intricate communication strategies seen in male dolphin alliances

Intricate communication strategies seen in male dolphin alliances.  It’s a...

Bee brains can understand the concept of zero.  Basic bee brains can comprehend the concept of zero, according to a new study conducted by researchers from Australia and France.

The results, published in the journal Science, show that <a href="https://www.earth.com/news/bees-high-nectar-special-neurons/">bees</a> understand that nothing belongs at the lower end of the spectrum and could help with teaching Artificial Intelligence new tasks. 

Human brains have 86,000 million neurons but bees have <a href="https://www.earth.com/news/bees-high-nectar-special-neurons/">fewer than one million</a>.

It was thought that only humans, or species with similarly complex brains, could understand zero, which according to the researchers, is the backbone of modern mathematical and technological advancements. 

“Zero is a difficult concept to understand and a mathematical skill that doesn't come easily - it takes children a few years to learn,” said Adrian Dyer, a member of the research team. “We've long believed only humans had the intelligence to get the concept, but recent research has shown monkeys and birds have the brains for it as well. What we haven't known - until now - is whether insects can also understand zero.”

For the study, bees were presented with a series of images that contained different quantities of things. The bees were given a reward if they gravitated toward the image with the lowest number of elements. 

The bees would choose the image with two elements versus three and so on, and were given a sugar solution treat in return. 

Occasionally the researchers would show the bees a blank image, and even though they had not been trained to respond to an empty page or the concept of zero, the bees gravitated toward the picture with nothing. 

The fact that the bees went to the blank image shows that bees understood that nothing was lower than the other quantities shown, and the researchers say this provides a new understanding of how different brains grasp abstract concepts. 

“How does a brain represent nothing? Could bees and other animals that collect lots of food items, have evolved special neural mechanisms to enable the perception of zero?” Asked Dyer. “If bees can learn such a seemingly advanced maths skill that we don't even find in some ancient human cultures, perhaps this opens the door to considering the mechanism that allows animals and ourselves to understand the concept of nothing.”

The researchers are most excited about the implications the results could have for Artificial Intelligence and teaching relatively basic robots to operate in complex environments. 
--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com </a>Staff Writer

Bee brains can understand the concept of zero

Bee brains can understand the concept of zero.  Basic bee...

Chemical attacks from parasites have big impacts on insects. A new study has revealed details about a behavior-modifying chemical warfare between leafcutter ants and the infectious parasites that live alongside them. The fungal parasite can overpower the leafcutter ants and control them, just as zombie ants are brainwashed to march out of their colonies by a different type of fungus.

Researchers from the <a href="https://www.uea.ac.uk/">University of East Anglia</a> teamed up with experts at the John Innes Centre and other institutions to investigate colony collapse, when the highly efficient ant farmers suddenly abandon their carefully-managed gardens.

Leafcutter ants are common across Latin America and are the most highly-evolved of fungus-growing ants, adapting their farming skills around 60 million years ago. The larvae of leafcutter ants consume a specific specialized fungus, which the ants cultivate using a mulch of chewed leaves. 

The farms of leafcutter ants are infected by a fungal parasite that has co-evolved to live off their fungal food supply called Escovopsis. The ants produce specialized bacteria on their bodies to control Escovopsis attacks, but the parasite can take over the fungus farm when colonies become stressed, resulting in colony collapse. Chemical attacks from parasites have big impacts on insects

“Leafcutter ants are superb farmers,” said study co-author Professor Matt Hutchings. “They patrol their gardens, remove foreign fungi and use antibiotic-producing bacteria on their bodies to kill off parasites - effectively using them as weedkillers. But the ways in which Escovopsis succeeds in getting through their defenses is not well understood.”


For the analysis, the researchers used samples of the food fungus from leafcutter ant colonies collected in <a href="https://www.earth.com/news/panama-dolphins-threatened-boat/">Panama</a> and infected them with the parasite.

The experts identified two families of molecules that were produced at high levels by the Escovopsis pathogen and tested them against the defensive bacteria produced by the ants.

The study revealed that the first molecule killed the ant’s bacteria, while the second manage to modify the behavior of the leafcutter ants. Under the influence of the second molecule, the ants fled their fungus garden. If the ants were exposed to the chemical weapon for long enough, it eventually killed them.

The strategy is similar to that used by a different fungus that is responsible for manipulating “zombie ants” to leave their colonies and climb up into the trees where they promote the spread of fungal spores after their death.

“We think the Escovopsis pathogen is always present in or around the nests and kept at bay by the ants' constant gardening and chemical defences,” said study co-author Professor Barrie Wilkinson.

“But when something unusual happens - a drought, or other environmental change perhaps - the parasite may gain a foothold and start increasing the levels of the chemical weapon compounds that cause behaviour changes and decrease the ants' weeding efficiency in their gardens.”

“From then on you have an escalating situation which leads to the appearance of dead ants, and the pathogen taking over, so the remaining ants eventually abandon the nest.”

Professor Wilkinson said that the research may lead to the development of ways to control pests such as leafcutter ants without using insecticides.

The research is published in the journal <a href="https://www.nature.com/ncomms/">Nature Communications</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Image Credit: <a href="https://www.uea.ac.uk/">University of East Anglia</a>

Chemical attacks from parasites have big impacts on insects

Chemical attacks from parasites have big impacts on insects. A...

A new study led by the <a href="http://www.ufl.edu/">University of Florida</a> exposes details about the practice of killing marine mammals such as dolphins, sea lions, and seals for use as fishing bait. 

As World Oceans Day approaches, the researchers are hoping to raise awareness on this issue, which they say has received little attention from scientists and conservationists thus far.

Many animals, including <a href="https://www.earth.com/news/dolphins-decline-amazon/">dolphins</a>, sea turtles, and birds, are accidentally caught as bycatch during commercial fishing, which is a well-known problem. What is not very well-known, however, is that the intentional capture of marine mammals for fishing bait is also widespread.

According to the study, more than 40 species of aquatic mammals have been utilized as bait since 1970 in at least 33 countries. The vast majority of these species were deliberately killed for use in at least one fishery. 

For example, dolphins are often killed to be used as shark bait in fisheries, a practice that was found to be most common in Asia and Latin America.

Study lead author Dr. Vanessa J. Mintzer said that the research was prompted by the observation of population declines in a few of the territories that are known to slaughter aquatic mammals for bait.

“Killing for use as bait is a primary threat affecting Amazon river dolphins, known as botos - the species and issue I have studied since my Ph.D. dissertation,” said Dr. Mintzer. “With this global review we wanted to see whether, and where, other species were killed for bait, and learn about possible solutions to stop the problem.”


The extent of killing and impact on the species identified in this study will remain largely unknown due to the fact that this is a convert practice. Dr. Mintzer said that obtaining better data should now become an urgent priority.

“For scientists already working on species and locations identified as ‘hot spots’ in this review, organized efforts should begin right away to estimate these numbers,” said Dr. Mintzer. 

“It took years to determine that the hunt for botos was unsustainable and now conservation actions need to be expedited. We need to identify other affected populations now to facilitate timely conservation actions.”

The study is published in the journal <a href="https://www.frontiersin.org/journals/marine-science">Frontiers in Marine Science</a>.

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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Dolphins are being killed for use as bait in fisheries

A new study led by the University of Florida exposes...

A new report from <a href="http://global.oup.com/">Oxford University Press</a> has revealed that there is a substantial increase in white shark activity when the animals are interacting with tourists and cage-diving operators. It is not yet known how this shift in behavior may be affecting the health of white shark individuals or populations.

In recent decades, wildlife tourism has emerged as one of the fastest growing sectors of the <a href="https://www.earth.com/news/carbon-footprint-tourism-industry/">tourism</a> industry. Tourists can cage-dive with white sharks in Australia, South Africa, the United States, Mexico, and New Zealand.


Previous research has demonstrated that wildlife tourism can cause species to behave unnaturally by changing their habitats or eating patterns. The current investigation shows that white sharks are more active and use up more energy when tourism operators are present compared to when they are not.

The researchers used monitoring devices to track ten white sharks at South Australia's Neptune Islands for nine days. They found that the overall dynamic body acceleration of the sharks was 61 percent higher when cage divers and operators were present.

Study lead author Charlie Huveneers is an associate professor in the Southern Shark Ecology Group (SSEG) research lab at <a href="https://www.flinders.edu.au/">Flinders University</a>.

“This suggests that the cage-diving industry has the potential to affect the energy budget of white sharks,” said Huveneers. “However, the mere presence of the cage-diving operators in the general vicinity of the sharks was not sufficient to elicit such behavioral changes. These only occurred when white sharks were close to the cage-diving vessels.”

“Spending time interacting with cage-diving operators might distract sharks from normal behaviors such as foraging on natural, energy-rich prey like pinnipeds.”

The study highlights the need for a better understanding of the impact of ecotourism on the health of white sharks.

The research is published in the journal <a href="https://academic.oup.com/conphys">Conservation Physiology</a>.

--

By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Cage diving may be affecting the health of great white sharks

A new report from Oxford University Press has revealed that...

The bond between a dog and their owner is a strong one, but how exactly does this connection form so cohesively and how does it impact human brain chemistry? 

Dog expert and author Meg Olmert spoke in-depth about just how exactly dogs affect our brain chemistry, and how a relationship between canines and humans that started 45,000 years ago has become such an integral part of our lives today.

It all boils down to hormones, particularly the pleasure hormones like dopamine and oxytocin.

Olmert told <a href="http://uk.businessinsider.com/how-having-dog-affects-your-body-brain-pet-oxytocin-animal-baby-2018-5?r=US&amp;IR=T">Business Insider</a> that seeing and petting your dog releases oxytocin in the brain. 

Oxytocin is a central hormone for bonding between mothers and their children and it promotes breast milk production in mammals. 

The fact that oxytocin strengthens mother and child bonds  helps explain why the connection with a pet can be so strong.

Spending time with your pet also alleviates stress as a result of the <a href="https://www.earth.com/news/dog-loves-smile/">mood-boosting hormones released</a> after interacting with your four-legged friend.

“You release oxytocin, the opioids, adrenaline, and serotonin. So, all of these great reward chemicals and anti-stress chemicals can be released in both you and the pet,” Olmert told Business Insider.

Not all dogs produce this response according to Olmert. When people are faced with any dog off the street, or even different breeds, the brain reacts in different ways.

Some breeds that are perceived as more aggressive like pit bulls or rottweilers will increase heart rate and anxiety, even triggering the fight or flight response.

“Dogs perceived as being fierce will trigger a different hormonal profile (increased cortisol, adrenaline, etc). They may not be an actual threat to illicit this defensive response,” Olmert told the <a href="http://www.dailymail.co.uk/sciencetech/article-5807069/Dogs-trigger-release-dopamine-oxytocin-way-children.html">Daily Mail</a>.

On the other hand, dogs from breeds that are considered more social and loyal like golden retrievers will trigger more of the pleasure response and oxytocin.

Having a pet can be a greatly rewarding experience as studies have shown that owning a dog comes with many health benefits, and Olmert’s work helps explain why the bond between pets and humans are so strong and long-lasting.

--

By <a href="mailto:kayvandette@gmail.com">Kay Vandette</a>, <a href="https://www.earth.com/">Earth.com</a> Staff Writer

How your bond with your dog changes your brain

The bond between a dog and their owner is a...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Nushagak Bay, a large estuary in southwest Alaska. Nushagak runs mainly north to south and exits in Bristol Bay, a large body of water in the Bering Sea.



"The bay is primarily fed by the Nushagak River, which begins in the Alaska Range and flows southwest approximately 450 km. The bay is also fed by several additional rivers including the Wood, Igushik, Snake and Weary rivers," says ESA.



"The dark colors of the Nushagak River are most likely due to tannins or lignins (chemical substances found in plants). Tannins and lignins from roots, leaves, seeds, bark and soil can leach into the water and give it a brown or even black colour. The sediments then flow southwards where it is mixed with the bluer waters of the bay."



Video/ Image Credit: ESA



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Nushagak Bay in southwest Alaska

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> (ACS) reveals that proteins on flu viruses are actually flexible, tilting and waving in a “breath-like” motion. According to the experts, these proteins could be used to better defend against the flu.



"The main antigenic targets of influenza virus are two surface glycoproteins, hemagglutinin (HA) and neuraminidase (NA). Whereas the structural and dynamical properties of both glycoproteins have been studied previously, the understanding of their plasticity in the whole-virion context is fragmented," wrote the researchers.



To investigate, the team conducted detailed simulations of the influenza A H1N1 virion, or the swine flu. The experts concluded that the visualizations show many new vulnerable states of flu viruses, which could improve future vaccines and antiviral drugs.



Video/ Image Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Flu viruses are more flexible than expected

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Lake Trasimeno, which is located west of Perugia in central Italy. It is the fourth largest lake in the country. While Trasimeno’s water level varies, it has a maximum depth of approximately six meters.&nbsp;



"In this Copernicus Sentinel-2 image, captured on 6 August 2022, the lake’s emerald green colour is likely due to the presence of phytoplankton. Streaks in the water, particularly visible in the west, indicate the presence of soil and sediments which have been stirred up by winds. Dark colored waters in the southern part of the lake indicate a presence of submerged and floating macrophytes (aquatic plants) as well as algae," says ESA.



"Surrounded by hills on three sides, Trasimeno is subject to heavy storms created by winds, especially from the north and west. There are three islets in the lake: Maggiore, Minore and Polvese (the largest). The lake’s shores are sparsely inhabited with only two popular villages: Castiglione del Lago and Passignano sul Trasimeno."



"Italy is experiencing its worst drought in 70 years which has affected drinking water supplies, hydroelectric power and agricultural production. High temperatures, hot winds and lack of rainfall are the main causes of drought in the Umbrian region which saw Lake Trasimeno’s drop 1.3 m, reaching the limit of the hydrometric zero in July 2022."



Video/Image Credit: ESA&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Lake Trasimeno in Central Italy

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Today's Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> describes a new self-powered nanosensor that can instantly detect mercury contamination with the tap of a finger.&nbsp;



The oxidized form of mercury can be harmful when it is ingested through contaminated water or food. This makes it necessary for experts to develop sensors that can quickly and accurately detect the presence of mercury.&nbsp;



Zong-Hong Lin and colleagues have now created a triboelectric nanosensor (TENS) that can detect mercury by simply by touching a sample. According to the researchers, their TENS could serve as the basis for similar devices to safely and remotely monitor other pollutants.



Video Credit: American Chemical Society&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Detecting mercury contamination with the tap of a finger

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Today’s Video of the Day from the <a href="https://www.acs.org/">American Chemical Society</a> explores the ability of salt to transform the way that foods and beverages taste. Salt is known to cover up undesirable flavors, such as bitterness in coffee or beer, but how exactly does sodium chloride change the taste of other compounds?



One previous study showed that, not only does salt suppress bitterness, but also enhances sweetness and sourness. Another study revealed that bitterness reduction by salt seems to be happening at the tongue receptor level as well as in the brain.&nbsp;



While it is known that salt taste is mediated by the presence of sodium channels in the form of taste buds, experts believe that there is also an unknown receptor responsible for how we taste salt that has not yet been identified.&nbsp;



Video Credit: ACS Reactions



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

How does salt makes things taste better?

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Santiago, the capital city of Chile. The city is located in the center of the Santiago Metropolitan Region, which has a population of about eight million people.&nbsp;



'The weather of Santiago resembles the Mediterranean climate with dry and warm summers with temperatures reaching up to 35°C (from October to March) and cool and humid winters that can drop to 0°C (from April to September)."



"The city lies in the centre of the country’s central valley around 80 km from the Pacific Ocean to the west and borders Argentina to the east. A tiny part of Argentina is visible in the top-right corner of the image where the mountain crest of the Andes Mountains acts as a divider between the two countries," says ESA.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Santiago, Chile in South America

[sendtonews key="JRaP49ISmm-2357509-12187" type="single"] Today’s Video of the Day from the...

Spiral,Galaxy,,Illustration,Of,Milky,Way

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Astronomers at <a href="https://www.jhu.edu/">Johns Hopkins University</a> have created an interactive map of the universe, including the actual position and real colors of 200,000 galaxies. The map allows the public to access data that was previously only available to scientists.



The map was developed using data collected by the Sloan Digital Sky Survey. For over two decades, a telescope in New Mexico was aimed at slightly different locations to capture the night sky.&nbsp;



"Growing up I was very inspired by astronomy pictures, stars, nebulae and galaxies, and now it's our time to create a new type of picture to inspire people," said map creator Brice Ménard, a professor at Johns Hopkins. "Astrophysicists around the world have been analyzing this data for years, leading to thousands of scientific papers and discoveries. But nobody took the time to create a map that is beautiful, scientifically accurate, and accessible to people who are not scientists. Our goal here is to show everybody what the universe really looks like."



"In this map, we are just a speck at the very bottom, just one pixel. And when I say we, I mean our galaxy, the Milky Way which has billions of stars and planets. We are used to seeing astronomical pictures showing one galaxy here, one galaxy there or perhaps a group of galaxies. But what this map shows is a very, very different scale."



"From this speck at the bottom, we are able to map out galaxies across the entire universe, and that says something about the power of science."



The <a href="https://mapoftheuniverse.net/">interactive map</a> is available online, where it can be downloaded for free.



Video Credit: Johns Hopkins&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Interactive map of the universe includes 200,000 galaxies

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Lesotho: Africa's "Kingdom in the Sky" Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features northwest Lesotho in South Africa.



According to ESA, Lesotho is the only nation in the world that lies completely above 1,000 m in elevation. The country is famous for its tall mountains and narrow valleys, and is known as Africa's "Kingdom in the Sky."



Out of a population of around two million people, about 80 percent live in rural areas. More than 75 percent of these people are engaged in <a href="https://www.earth.com/news/climate-change-will-have-a-global-impact-on-agriculture/">agriculture</a>, including rainfed cereal production and animal grazing.&nbsp;



ESA reports that the country’s agricultural system faces a growing number of issues, with climate-related vulnerabilities such as drought, floods and extreme temperatures occurring more frequently. 



Diamonds are amongst the minerals found in the mountains. Indeed, Lesotho can truly be called the Kingdom in the Sky. Beautiful, culturally rich, safe, affordable, and easily accessible from Durban and Johannesburg, mountainous Lesotho is a vastly underrated travel destination. the Kingdom of Lesotho (Sotho: 'Muso oa Lesotho) is an enclaved country in southern Africa. It is just over 30,000 km2 (11,583 sq mi) in size and has a population of around 2 million.



Video Credit: ESA&nbsp;&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer 



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Lesotho: Africa's "Kingdom in the Sky"

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features Dublin, the capital and largest city of Ireland. Beyond its pub culture, Dublin is known as a modern culinary destination and a UNESCO City of Literature.



"Dublin is located near the midpoint of Ireland’s east coast in the province of Leinster. The city, which covers an area of around 115 square kilometers, is bordered by the Dublin Mountains, a low mountain range to the south, and is surrounded by flat farmland to the north and west," says ESA.



"The city straddles the River Liffey, which rises in the Wicklow Mountains and flows around 80 kilometers eastwards through the city of Dublin, in which it is canalised and bordered with quays. It then empties into Dublin Bay, an arm of the Irish Sea."



Dublin has an abundance of green spaces, including one of the largest enclosed public parks in any European capital city. Phoenix Park, which was originally formed as a royal hunting park in the 1660s, includes 707 hectares of green space.



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The city of Dublin on Ireland's east coast

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Today's Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the province of Zaragoza in northeast Spain. The image was captured by the Copernicus Sentinel-2 mission.



"Together with the provinces of Huesca and Teruel, Zaragoza formed the old kingdom of Aragon. Its capital, also called Zaragoza (not visible in this image) is home to around half of Aragon’s population," says ESA.



"The Ebro River can be seen winding its way through the province from west to east in this image. Between its source in the Cantabrian Mountains in the northwest and its delta on the Mediterranean coast, the Ebro River is fed by more than 200 tributaries as it flows 910 km across much of northern Spain."



Since rainfall is very scarce in this region, irrigation in the Ebro basin is critically important. In the valleys surrounding the Ebro River, many fields are used for growing crops such as corn, wheat, and barley.



Video/ Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The province of Zaragoza in northeast Spain

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> reveals the evolution of the Columbia Glacier in southeastern Alaska. Columbia is among the fastest shrinking glaciers in the world, and the video documents its rapid retreat over the years.&nbsp;



Columbia Glacier is a large, multi-branched calving glacier that flows out of the Chugach Mountains to the Prince William Sound.&nbsp;



According to USGS, Columbia had a long history of stability prior to 1980, with a length 41 miles, and small, short-lived advances or retreats.



In the years since 1980, however, satellite images have captured Columbia’s alarming retreat. By using false-color images, scientists can distinguish between snow and ice, open water, vegetation, and rocky debris on the glacier’s surface.



The series of false-color images featured in today's video were acquired over the span of 35 years. You can see that by 2021, the glacier’s main branch had retreated about 15 miles from its initial position.



The Columbia Glacier has also lost more than 50 percent of its volume, mostly due to calving. <a href="https://www.earth.com/video/nasa-reveals-3d-visual-of-an-atmospheric-river/">NASA</a> reports that while climate change likely started the retreat, mechanical processes kept the disintegration going.



The NASA images are provided by Jesse Allen, Robert Simmon, Joshua Stevens, and Lauren Dauphin using data from Landsat satellites, from the U.S. Geological Survey, and data from MODIS on NASA’s Terra satellite. The structure of Columbia’s moraine played a large role in the stability of the glacier before 1980. 



Like other tidewater glaciers, the Columbia built up a moraine over time, and the mixture of ice and rock functioned like a dam keeping out the sea. It was supported on one end by the shoreline and by the underwater terminal moraine at the other.



Video Credit: NASA Earth Observatory/&nbsp; NASA’s Scientific Visualization Studio



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



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The rapid retreat of the Columbia Glacier

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> features the Pyrenees Mountains, which form a natural boundary between France and Spain in southwest Europe.



The mountain range is 430 kilometers in length. It stretches from the Mediterranean Sea on the east to the Atlantic Ocean on the west.



At an elevation of 3404 meters, Pico de Aneto is the highest mountain peak in the Pyrenees, and the third-highest peak in Spain. Pico de Aneto is located in the Posets-Maladeta Natural Park, which spans more than 82,000 acres.&nbsp;



"Geological studies have revealed that the Pyrenees Mountains have been around for longer than the Alps, with their sediments first deposited in coastal basins during the Paleozoic and Mesozoic eras," reports ESA.



"The entire mountain range formed due to the upwelling of large sedimentary rocks by the collision of the Iberian and the Eurasian plate around 100 to 150 million years ago, followed by intense erosion from ice and water."



The western Pyrenees receive more precipitation due to moisture blowing in from the Atlantic Ocean. The mountain range contains many lakes, several small glaciers, and some of the highest waterfalls in Europe.



Video &amp; Image Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The Pyrenees Mountains in southwest Europe

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Earth,Like,Exoplanet,3d,Render

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Today's Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes two exoplanets that are orbiting a star 218 light-years away. A team of researchers led by the University of Montreal has found evidence that these planets are "water worlds."



The experts used data from NASA’s Hubble and Spitzer Space Telescopes. They discovered that exoplanets Kepler-138 c and Kepler-138 could be composed largely of water.



"We previously thought that planets that were a bit larger than Earth were big balls of metal and rock, like scaled-up versions of Earth, and that's why we called them super-Earths," explained study co-author Björn Benneke.&nbsp;



"However, we have now shown that these two planets, Kepler-138 c and d, are quite different in nature and that a big fraction of their entire volume is likely composed of water. It is the best evidence yet for water worlds, a type of planet that was theorized by astronomers to exist for a long time."



Video Credit: NASA Goddard



Image Credit: NASA, ESA, and Leah Hustak (STScI)



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Two distant planets may be "water worlds"

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Satellites reveal how Earth's systems are interconnected Today’s Video of the Day from <a href="https://www.nasa.gov/goddard">NASA Goddard</a> describes Earth’s interconnected systems, and how this network is affected by rising temperatures.&nbsp;



During 2020, average global temperatures matched the hottest year on record. The hurricane season was also record-breaking, with many of the storms intensifying at extraordinary speeds. Hot water in the ocean is fuel for hurricanes. The satellite data shows that it's all one interconnected system showing how Satellites reveal how Earth's systems are interconnected.



According to NASA, dust swept up from Northern Africa plays a major role in the formation of hurricanes, and is also a key source of fertilization in the Amazon rainforest. As a result of<a href="https://www.earth.com/news/seagrass-wasting-disease-is-fueled-by-climate-change/"> climate</a> change, dust plumes are expected to decline, which will have an effect on vegetation far away.&nbsp;



Images from Earth-observing satellites show how the world’s plant life is affected by natural disasters, fires, and deforestation. Satellites also reveal how widespread changes in vegetation impact waterways,&nbsp; the climate, air quality. Satellites communicate by using radio waves to send signals to the antennas on the Earth. "Earth From Space" is a groundbreaking two-hour special that reveals a spectacular new space-based vision of our planet. 



Video Credit: NASA Goddard&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites reveal how Earth's systems are interconnected

[sendtonews key="JbW4VsY53O-1632195-12187" type="single"] Satellites reveal how Earth's systems are interconnected...

Today’s Video of the Day from the <a href="https://welcome.miami.edu/">University of Miami</a> Rosenstiel School of Marine and Atmospheric Science explores how changes in water temperatures have affected tiger shark habitats and movements in the North Atlantic Ocean. The study reveals that rising temperatures have caused the sharks to shift toward the poles over the past 40 years.



“Tiger shark annual migrations have expanded poleward, paralleling rising water temperatures,” explained study lead author Neil Hammerschlag. “These results have consequences for tiger shark conservation, since shifts in their movements outside of marine protected areas may leave them more vulnerable to commercial fishing.”



The researchers analyzed nine years of tracking data from satellite-tagged tiger sharks, combined with four decades of conventional tag and recapture data provided by National Oceanic and Atmospheric Administration (NOAA) Cooperative Shark Tagging Program.



The experts found that during the last decade of record heat, for every one-degree Celsius increase in water temperatures, tiger sharks migrated further poleward by over 400 kilometers. They also migrated two weeks earlier than usual to waters off the northeastern coast of the United States.



“Given their role as apex predators, these changes to tiger shark movements may alter predator-prey interactions, leading to ecological imbalances, and more frequent encounters with humans,” concluded Professor Hammerschlag.



Video Credit: University of Miami Rosenstiel School of Marine and Atmospheric Science



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Tiger sharks are shifting poleward as temperatures rise

Today’s Video of the Day from the University of Miami...

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> is focused on the melt ponds that emerge during the spring and summer on the Greenland Ice Sheet, which is the largest ice mass in the northern hemisphere.



"Melt ponds are vast pools of open water that form on both sea ice and ice sheets and are visible as turquoise-blue pools of water in this Copernicus Sentinel-2 image," says ESA.



"When snow and ice melts atop glaciers, water flows in channels and streams and collects in depressions on the surface. These melt ponds can speed up the melting of the surrounding ice since they greatly reduce the ice’s ability to reflect sunlight."



"This can create a positive feedback where an increasing number of melt ponds absorb more heat which causes ice cover to melt even faster."



According to ESA, Greenland has been hit with a late-season heatwave that began in early September. This caused the type of melt event that usually occurs in the middle of summer.



"In a recent paper published in Nature Climate Change, scientists found that major sea-level rise from the melting of the Greenland ice cap is now ‘inevitable’ even if the burning of fossil fuels were to halt overnight," says ESA. "Using satellite observations of Greenland ice loss and ice cap from 2000 to 2019, the team found the losses will lead to a minimum rise of 27 cm regardless of climate change."



Video Credit: ESA&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Melt ponds on the Greenland Ice Sheet

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes a new map of Mars that is providing insight into the planet’s watery past. The map also reveals where future missions could safely land on Mars.&nbsp;



The map has been created over the last decade using observations of water-rich rocks and mineral deposits. The images were captured by ESA’s Mars Express and NASA’s Mars Reconnaissance Orbiter.



"A big surprise is the prevalence of these minerals, with the map revealing hundreds of thousands of water-affected locations in the oldest parts of the planet," says ESA. "The new data will help answer exciting questions about Mars’ climate history, whether water was globally persistent or confined to short, intense episodes, and whether the conditions were ever suitable for life."



"Specifically, the map shows the locations and abundances of aqueous minerals. These are from rocks that have been chemically altered by the action of water in the past, and have typically been transformed into clays and salts."



According to John Carter of the Institut d’Astrophysique Spatiale (IAS), our collective understanding of Mars has been oversimplified. He explained that planetary scientists have tended to think that only a few types of clay minerals on Mars were created during its wet period, then as the water gradually dried up, salts were produced across the planet.



The new map shows that the composition of Mars is much more complicated than what we thought. For example, while many salts formed after Martian clays, there are some salts that are presumed to be older than some of the clays.&nbsp;



“The evolution from lots of water to no water is not as clear cut as we thought, the water didn’t just stop overnight. We see a huge diversity of geological contexts, so that no one process or simple timeline can explain the evolution of the mineralogy of Mars. That’s the first result of our study. The second is that if you exclude life processes on Earth, Mars exhibits a diversity of mineralogy in geological settings just as Earth does,” said Carter.



Video Credit: ESA



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

The history of Mars is much more complex than we thought

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Today's Video of the Day from the <a href="https://www.stowers.org/">Stowers Institute for Medical Research</a> describes how cavefish adapted to a sedentary lifestyle over tens of thousands of years. 



The experts found that the muscle metabolism of cavefish has been genetically reprogrammed over time. As a result, the animals have experienced major changes in their morphology and behavior. Despite these changes, however, the cavefish remain healthy and fit.



The research may provide new clues about the evolutionary consequences of prolonged physical inactivity in humans.&nbsp;



“It’s no surprise that people are moving less and less as technology has advanced,” said Rohner. “With cavefish, we have a unique system where we can study what might happen if people remained couch potatoes over very, very long periods of time.”



Video Credit: Stowers Institute for Medical Research



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Cavefish are healthy despite their sedentary lifestyle

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Today’s Video of the Day from <a href="https://earthobservatory.nasa.gov/">NASA Earth Observatory</a> some of the most incredible waves in the world, as seen by Landsat satellites.



"With more than 370,000 miles of coastline on Earth, there are plenty of places where epic waves build up, curl over, and hurtle toward the shore.- much to the thrill of surfers," says NASA. "There are some places where these waves are so magnificent that they can be seen from space."



"With the broad perspective of satellites, we can see how these iconic waves develop into the world’s tallest, longest, fastest, and heaviest."



Video Credit: NASA Earth Observatory&nbsp;



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By <a href="mailto:csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Editor



Check us out on <a href="https://www.earth.com/earthsnap/">EarthSnap</a>, a free app brought to you by Eric Ralls and Earth.com.

Satellites capture the world's biggest and fastest waves

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Today’s Video of the Day from the <a href="https://www.esa.int/">European Space Agency</a> describes why satellite images and measurements of our planet have become "essential to our survival, offering a new outlook of our world."&nbsp;



Rising sea levels pose one of the biggest societal threats associated with climate change. According to ESA, satellite altimeter missions such as Copernicus Sentinel-6 are essential in monitoring global and regional changes in sea level.



"Unbeknown to many, the island of Crete, Greece, plays an important role in the Copernicus satellite altimetry constellation and on an international stage," reports ESA.



"Satellite altimetry data have to be continuously monitored at the ESA’s Permanent Facility for Altimetry Calibration where different techniques have pioneered the use of transponders to provide the best measurements to validate satellite altimeters in space soon after launch."



Dr. Craig Donlon explains that, by understanding planet Earth through satellite measurements, we are able to find evidence of change.&nbsp;



Video Credit: European Space Agency&nbsp;



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By <a href="http://csexton@earth.com">Chrissy Sexton</a>, <a href="https://www.earth.com/staff/">Earth.com</a> Staff Writer

Satellites have become essential to our survival

[sendtonews key="761m2QQvR1-2035772-12187" type="single"] Today’s Video of the Day from the...