Phylum Chordata Bateson, 1885 - chordates
   Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
     Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
       Superorder Neognathae Pycraft, 1900 see Cohort Neognathae Pycraft, 1900
         Order Anseriformes Wagler, 1831 - waterfowl and screamers
           Family Anatidae Vigors, 1825 - ducks, geese, swans
             1 Subfamily Anseranatinae Stejneger, 1885 - pied geese see Family Anseranatidae Sclater, 1880
             2 Subfamily Anserinae Vigors, 1825 - geese
             3 Subfamily Anatinae Vigors, 1825 - pond ducks