[Mammalia] Linnaeus, 1758 - mammals
   Xenarthra Cope, 1889 - xenarthrans see Magnorder Xenarthra Cope, 1889
     Megalonychidae Gervais, 1855 - West Indian sloths and two-toed tree sloths
       Choloepus Illiger, 1811 - two-toed tree sloths
         Choloepus didactylus (C. Linnaeus, 1758) - southern two-toed sloth