1) Family megalonychidae 2) Mammal family 3) Two-toed sloths 
Megalonychidae is a group of sloths including the extinct Megalonyx and the living two toed sloths. Megalonychids first appeared in the early Oligocene, about 35 million years ago, in southern Argentina (Patagonia), and spread as far as the Antilles by the early Miocene. Megalonychids first reached North America by island-hopping, about 9 million ...
[n] - two-toed sloths
family Megalonychidae noun mammal family consisting of the two-toed sloths