   the anserinae is a subfamily in the waterfowl family anatidae. it includes the swans and true geese. under alternative systematical concepts (see e.g., terres & nas, 1991), it is split into two subfamilies, the anserinae containing the geese and the ducks, while the cygninae contain the swans. ==systematics== swans â tribe cygnini *genus cygnus â true swans :the black-and-yellow-billed swans are sometimes separated in the genus olor. true geese â tribe anserini *genus anser â grey geese *genus chen â white geese (sometimes included in anser) *genus branta â black geese unresolved *genus coscoroba â coscoroba swan the following two genera are distinct from other geese and often elevated to a subfamily of their own (cereopsinae), or alternatively into the shelduck subfamily tadorninae: tribe cereopsini *genus cereopsis â cape barren goose *genus cnemiornis â new zealand geese (prehistoric) there are some enigmatic subfossils of very large goose-like birds from the hawaiian islands which do not appear to be moa-nalos (goose-sized dabbling ducks). they cannot be assigned to any genus living today, though most if not all may be fairly close to branta: * geochen rhuax â initially allied with cereopsis, but this seems hardly correct for reasons of biogeography. * giant hawaiÊ»i goose, ?branta sp. * giant oÊ»ahu goose, anatidae sp. et gen. indet. ==references== * terres, john k. & national audubon society (1991): the audubon society encyclopedia of north american birds. wings books, new york. isbn 0-517-03288-0 ==external links== 
Anserinae Bird_subfamilies