- Family: Megalonychidae - General information and anatomy of the two toed sloth.
- Two-toed Sloth - Information from Wikipedia on the classification of the family Megalonychidae which contains just two species, Choloepus didactylus and Choloepus hoffmanni.
- Two-toed Sloth - The two extant species of two-toed sloths are Linnaeus's (Choloepus didactylus) and Hoffmann's two-toed sloth (Choloepus hoffmanni). They are the only members of the genus Choloepus and are the only living members of the family Megalonychidae.
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