Imperium naturæ C. Linnaeus, 1758 - nature
   Mundus Plinius - physical world
     naturalia - natural bodies
       Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Mammalia Linnaeus, 1758 - mammals
           Quadrupedia Linnaeus, 1758 see Class Mammalia Linnaeus, 1758
             Order Feræ Linnaeus, 1758 see Grandorder Ferae Linnaeus, 1758
               Genus Urſus Linnaeus, 1758 - black, brown, polar, sun, and sloth bears
                 Urſus Arctos Linnaeus, 1758 - brown bear