Class Mammalia Linnaeus, 1758 - mammals
   Subclass Theria Parker & Haswell, 1897
     Order Carnivora Bowdich, 1821 - carnivores
       Suborder Caniformia Kretzoi, 1943
         Family Ursidae Batsch, 1788 - bears
           Genus Ursus Linnaeus, 1758 - black, brown, polar, sun, and sloth bears
             Ursus arctos Linnaeus, 1758 - brown bear
               Ursus arctos sitkensis Merriam, 1896