Class [Mammalia] Linnaeus, 1758 - mammals
   Order Carnivora Bowdich, 1821 - carnivores
     Family Ursidae Batsch, 1788 - bears
       Genus Ursus Linnaeus, 1758 - black, brown, polar, sun, and sloth bears
         1 Ursus americanus Pallas, 1780 - American black bear
         2 Ursus arctos Linnaeus, 1758 - brown bear