Class [Mammalia] Linnaeus, 1758 - mammals
   Order Artiodactyla Owen, 1848 - even-toed ungulates see Order Cetartiodactyla Montgelard, Catzeflis & Douzery, 1997
     Family Bovidae Gray, 1821 - antelope, cattle, bison, buffalo, goats, and sheep
       Genus Ovis Linnaeus, 1758 - sheep
         1 Ovis ammon (C. Linnaeus, 1758) - argali
         2 Ovis canadensis Shaw, 1804 - American bighorn
         3 Ovis dalli Nelson, 1884 - Dall sheep
         4 Ovis nivicola Eschscholtz, 1829 - Siberian bighorn
         5 Ovis orientalis Gmelin, 1774 - mouflon see Ovis aries orientalis Gmelin, 1774
         6 Ovis aries Linnaeus, 1758 - domestic sheep
         7 Ovis vignei Blyth, 1841 - urial