. . . "Chordata" . "Cygnus" . "Aves" . . . . "Cygnus columbianus (Ord 1815)" . "Tundra Swan" . . . . "Animalia" . "Anatidae" . "(Ord 1815)" . . . . . . . . . . "Anseriformes" . . "Cygnus columbianus" .