living organisms see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Superkingdom Eukaryotae see Domain Eukaryota Chatton, 1925
     Kingdom Animalia Linnaeus, 1758 - animals
       Subkingdom Eumetazoa Butschli, 1910 see [unranked] Eumetazoa Bütschli, 1910
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Mammalia Linnaeus, 1758 - mammals
               Subclass Theria Parker & Haswell, 1897
                 Infraclass Eutheria Gill, 1872
                   Order Rodentia Bowdich, 1821 - rodents
                     Suborder Myomorpha Brandt, 1855 see Infraorder Myomorphi
                       Superfamily Muroidea Batsch, 1788
                         Family Muridae Batsch, 1788 - rats, mice, hamsters, voles, lemmings, and gerbils
                           Subfamily Murinae Batsch, 1788 - Old World mice and rats
                             Genus Rattus Fischer de Waldheim, 1803 - rats
                               1 Rattus rattus (C. Linnaeus, 1758) - roof rat
                               2 Rattus norvegicus (Berkenhout, 1769) - brown rat
                               3 Rattus exulans (Peale, 1848) - Polynesian rat