Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Galliformes Temminck, 1820 - fowl
                   Suborder Galli see Order Galliformes Temminck, 1820
                     Family Phasianidae Vigors, 1825 - turkeys, grouse, pheasants, partridges
                       Subfamily Tetraoninae Vigors - grouse see Family Tetraonidae Vigors, 1825
                         Tribe Tetraonini Leach, 1820 see Subfamily Tetraoninae Vigors
                           Genus Lagopus Brisson, 1760 - ptarmigan
                             1 Lagopus mutus (Montin, 1776) - rock ptarmigan see Lagopus muta (Montin, 1781)
                             2 Lagopus lagopus (Linnaeus, 1758) - willow grouse
                             3 Lagopus leucurus (Richardson, 1831) - white-tailed ptarmigan see Lagopus leucura (Richardson, 1831)