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 Tetraonidae Vigors, 1825
             Genus Tetrao Linnaeus, 1758
               1 Tetrao mlokosiewiczi Taczanowski, 1875 - Caucasian grouse see Lyrurus mlokosiewiczi (Taczanowski, 1875)
               2 Tetrao tetrix Linnaeus, 1758 - black grouse see Lyrurus tetrix (Linnaeus, 1758)
               3 Tetrao parvirostris Bonaparte, 1856 - black-billed capercaillie
               4 Tetrao urogallus Linnaeus, 1758 - western capercaillie