Some point to opposable thumbs, some to bipedalism, and still others point to language as being a defining characteristic of human primates. But just like thumbs (Sulawesi Bear Cuscus), bipedalism (Birds!), and language (Ape Language: Koko, Nim Chimpsky) one of the last bastions of human exceptionalism is under attack: blowjobs. And from an unexpected critter: Bats.
Up until now, fellatio, or "blowjobs" (known to the layperson as "BJs"), were thought to be limited to humans and some greater primates, specifically Bonobos (Pan paniscus). That is until these guys came along: