Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Galliformes Temminck, 1820 - fowl
           Family Phasianidae Vigors, 1825 - turkeys, grouse, pheasants, partridges
             Subfamily Phasianinae Vigors, 1825 - pheasants and partridges
               Genus Tetraogallus Gray, 1832
                 1 Tetraogallus caucasicus (Pallas, 1811) - Caucasian snowcock
                 2 Tetraogallus caspius (Gmelin, 1784) - Caspian snowcock
                 3 Tetraogallus tibetanus Gould, 1854 - Tibetan snowcock
                 4 Tetraogallus altaicus (Gebler, 1836) - Altai snowcock
                 5 Tetraogallus himalayensis Gray, 1843 - Himalayan snowcock