Class Mammalia Linnaeus, 1758 - mammals
   Order Perissodactyla Owen, 1848 - odd-toed ungulates
     1 Family Equidae Gray, 1821 - horses, zebras, and asses
     2 Family Tapiridae Gray, 1821 - tapirs
     3 Family Rhinocerotidae Gray, 1821 - rhinoceroses