- 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.

