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Family: Bradypodidae
http://animaldiversity.ummz.umich.edu/chordata/mammalia/xenarthra/bradypodidae.html
General information and anatomy of the three toed sloth.
Family: Megalonychidae
http://animaldiversity.ummz.umich.edu/chordata/mammalia/xenarthra/megalonychidae.html
General information and anatomy of the two toed sloth.