Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
               Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
                 Order Anseriformes Wagler, 1831 - waterfowl and screamers
                   Family Anatidae Vigors, 1825 - ducks, geese, swans
                     Subfamily Anatinae Vigors, 1825 - pond ducks
                       Tribe Tadornini see Tribe Anserini Vigors, 1825
                         Genus Tadorna Boie, 1822
                           1 Tadorna tadorna (Linnaeus, 1758) - common shelduck
                           2 ‡Tadorna cristata (Kuroda, 1917) - crested shelduck
                           3 Tadorna radjah (Lesson, 1828) - radjah shelduck
                           4 Tadorna ferruginea (Pallas, 1764) - ruddy shelduck
                           5 Tadorna cana (Gmelin, 1789) - South African shelduck
                           6 Tadorna tadornoides (Jardine & Selby, 1828) - Australian shelduck
                           7 Tadorna variegata (Gmelin, 1789) - paradise shelduck