Sloth

Sloths are the six species of medium-sized mammals belonging to the families Megalonychidae (two-toed sloth) and Bradypodidae (three-toed sloth). They are part of the order Pilosa and are therefore related to armadillos and anteaters, which sport a similar set of specialized claws. Sloths are arboreal (tree dwelling) residents of the jungles of Central and South America, and are known for being slow-moving. Sloth fur exhibits specialized functions: the outer hairs grow in a direction opposite from that of other mammals. Because sloths spend so much time with their legs above their bodies, their hairs grow away from the extremities in order to provide protection from the elements while the sloth hangs upside down. In most conditions, the fur hosts two species of symbiotic cyanobacteria, which provide camouflage.

http://en.wikipedia.org/wiki/Sloth