Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Pilosa Flower, 1883 - sloths
       Suborder Folivora Delsuc, Catzeflis, Stanhope & Douzery, 2001
         Family Bradypodidae Batsch, 1788 - three-toed tree sloths
           Genus Bradypus Linnaeus, 1758 - three-toed tree sloths
             Bradypus pygmaeus R.P. Anderson & C.O. Handley Jr., 2001 - pygmy three-toed sloth