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 Anseres nom. inval. see Order Anseres Linnaeus, 1758
             1 Genus Platelea nom. inval. see Genus Platalea Linnaeus, 1758
             2 Genus Pelecanus nom. inval. see Genus Pelecanus Linnaeus, 1758
             3 Genus Cygnus nom. inval. see Genus Anas Linnaeus, 1758
             4 Genus Anas nom. inval. see Genus Anas Linnaeus, 1758
             5 Genus Mergus nom. inval. see Genus Mergus Linnaeus, 1758
             6 Genus Graculus nom. inval.
             7 Genus Colymbus nom. inval. see Genus Colymbus Linnaeus, 1758
             8 Genus Larus nom. inval. see Genus Larus Linnaeus, 1758