Two-toed sloths are mammals of Central and South America. They have a gestation period of between six months and a year, depending on the exact species. The mother gives birth to a single young, while hanging up-side down. The young are born with claws, and are weaned after about a month, although they will remain with the mother for several more months, and do not reach sexual maturity until the age of 3 years, in the case of females, or 4–5 years, in the case of males.
Two-toed sloths spend most of their life hanging upside down from trees. They cannot walk so they pull hand over hand to move around, which is at an extremely slow rate. Being predominantly nocturnal, their fur, which grows a greenish algae to blend in, is their main source of protection.