Also known as wingers. You may have noticed that many non-primate animals have extremely un-humanlike limbs. They may have wings, they may have fins, they may have claws like a lobster or long grappling hooks like a sloth. But because Most Animators Are Human, they have a tendency to fall back on making the very different anatomy of animal characters -- even those who aren't, strictly speaking, anthropomorphic -- do things they'd be physically incapable of in order to closely mimic human actions. Therefore, every animal forelimb, no matter how little it resembles a human hand, is prehensile.