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
               01 [Ursus arctos arctos] Linnaeus, 1758 - brown bear
               02 Ursus arctos alascensis Merriam, 1896
               03 Ursus arctos beringianus Middendorff, 1851
               04 Ursus arctos californicus Merriam, 1896
               05 Ursus arctos collaris Cuvier, 1824
               06 Ursus arctos crowtheri Schinz, 1844
               07 Ursus arctos dalli Merriam, 1896
               08 Ursus arctos gyas Merriam, 1902
               09 Ursus arctos horribilis Ord, 1815
               10 Ursus arctos isabellinus Horsfield, 1826
               11 Ursus arctos lasiotus Gray, 1867
               12 Ursus arctos middendorffi Merriam, 1896
               13 Ursus arctos pruinosus Blyth, 1854 - brown bear
               14 Ursus arctos sitkensis Merriam, 1896
               15 Ursus arctos stikeenensis Merriam, 1914
               16 Ursus arctos syriacus Hemprich & Ehrenberg, 1828