Imperium naturae C. Linnaeus, 1758 - nature
   Regnum Animale C. Linnaeus, 1758 - animal kingdom see Kingdom Animalia Linnaeus, 1758
     Class Mammalia Linnaeus, 1758 - mammals
       Ungulata Linnaeus, 1766
         Order Belluae Linnaeus, 1758
           33 Genus Eqvus Linnaeus, 1758 see Genus Equus Linnaeus, 1758
           34 Genus Hippopotamus Linnaeus, 1758 - hippopotamus
           35 Genus Sus Linnaeus, 1758 - Eurasian pigs
           36 Genus Rhinoceros Linnaeus, 1758 - Asian one-horned rhinoceroses