Class [Mammalia] Linnaeus, 1758 - mammals
   Order Perissodactyla Owen, 1848 - odd-toed ungulates
     Family Equidae Gray, 1821 - horses, zebras, and asses
       Genus Equus Linnaeus, 1758 - horses, zebras, and asses
         Equus ferus Boddaert, 1785 - wild horse see Equus caballus Linnaeus, 1758