Class Aves Linnaeus, 1758 - birds see Subclass Aves Linnaeus, 1758
   Subclass Neornithes Gadow, 1893 see Clade Neornithes Gadow, 1893
     Infraclass Neoaves Sibley et al., 1988 see Subcohort Neoaves Sibley et al., 1988
       Parvclass Galloanserae Sibley, Ahlquist & Monroe Jr., 1988 see Subcohort Galloanserae Sibley, Ahlquist & Monroe Jr., 1988
         Superorder Anserimorphae see Order Anseriformes Wagler, 1831
           Order Anseriformes Wagler, 1831 - waterfowl and screamers
             Infraorder Anserides see Suborder Anseres Linnaeus, 1758
               Family Anatidae Vigors, 1825 - ducks, geese, swans
                 Subfamily Anatinae Vigors, 1825 - pond ducks
                   Tribe Anserini Vigors, 1825 - geese see Subfamily Anserinae Vigors, 1825
                     Genus Anser Brisson, 1760
                       Anser cygnoides (Linnaeus, 1758) - swan goose
                       Anser brachyrhynchus Baillon, 1834 - pink-footed goose
                       Anser fabalis (Latham, 1787) - bean goose
                       Anser albifrons (Scopoli, 1769) - greater white-fronted goose
                       Anser erythropus (Linnaeus, 1758) - lesser white-fronted goose
                       Anser anser (Linnaeus, 1758) - greylag goose
                       Anser caerulescens (Linnaeus, 1758) - snow goose
                       Anser rossii Cassin, 1861 - Ross's goose
                       Anser canagica (Sewastianow, 1802) - emperor goose see Anser canagicus (Sevastianov, 1802)
                       Anser indicus (Latham, 1790) - bar-headed goose