Systema naturæ - nature
   Universum - universe see [unranked] Mundus Plinius
     naturalia - natural bodies
       Regnum Animale nom. inval. - animal kingdom see Kingdom Animalia Linnaeus, 1758
         Class Aves Plinius, nom. inval. - birds see Class Aves Linnaeus, 1758
           Order Gallinae nom. inval. see Order Gallinae Linnaeus, 1758
             1 Genus Struthio nom. inval. see Genus Struthio Linnaeus, 1758
             2 Genus Casuarius nom. inval. see Genus Casuarius Brisson, 1760
             3 Genus Otis nom. inval. see Genus Otis Linnaeus, 1758
             4 Genus Pavo nom. inval. see Genus Pavo Linnaeus, 1758
             5 Genus Meleagris nom. inval. see Genus Meleagris Linnaeus, 1758
             6 Genus Gallina nom. inval. see Genus Phasianus Linnaeus, 1758
             7 Genus Tetrao nom. inval. see Genus Tetrao Linnaeus, 1758