If you’ve ever seen gorillas in the zoo or watched them on TV, you know just how awe-inspiring they can be. But away from humans’ prying eyes, these great apes get up to some strange activities people have never before been able to witness—until now. Thanks to a spy robot, a group of scientists managed to get an inside look at gorilla society. And their findings are changing everything we thought we knew about these animals. They’re not the creatures we thought they were.