(Dead sloths have been known to retain their grip and remain suspended from a branch.) Sloths even sleep in trees, and they sleep a lot—some 15 to 20 hours every day. Even when awake they often ...

In fact, sloths sleep, mate, and even give birth all while hanging upside down on a branch. And, as you might expect, that requires some pretty extreme adaptations. Cliffe: They've got special ...