Bonobos, along with chimpanzees and orangutans, are humans’ closest genetic relatives, and are frequently studied for clues about the nature of human evolution. These Great Apes are, as it turns out, a lot like us, but a recent study reveals something about bonobos that we’d perhaps rather not know. Often referred to as the “hippie” apes (partially because bonobos have a lot of casual sex . . a perfectly acceptable “Hey, how’s it going?” in bonobo-speak), bonobos don’t quite live up to the moniker, it appears.