Family: Bradypodidae - General information and anatomy of the three toed sloth.
Family: Megalonychidae - General information and anatomy of the two toed sloth.
Three-toed Sloth - Information from Wikipedia on the four sloths included in the Bradypodidae family.
Two-toed Sloth - Information from Wikipedia on the classification of the family Megalonychidae which contains just two species, Choloepus didactylus and Choloepus hoffmanni.
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