Any member of the family Anatidae, web-footed birds with a broad bill containing fine plates, or lamellae; usually stocky and often long-necked, including ducks, geese (see goose), and swans. Waterfowl feed by dabbling, diving, or grazing. Most species are social and have an array of formal displays and group cohesion signals. Almost all breed in water. The female usually selects the nest site, builds the nest from any vegetation within reach, and incubates the 3–12 eggs. Shortly after hatching, the young imprint on their mother (see imprinting). Many species are migratory.
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Waterfowl are certain wildfowl of the order Anseriformes, especially members of the family Anatidae, which includes ducks, geese, and swans.
They are strong swimmers with medium to large bodies. They have historically been an important food source, and continue to be hunted as game, or raised as poultry for meat and eggs. The domestic duck is sometimes kept as a pet.
Some definitions of the term 'waterfowl' include the saltwater shorebirds or waders, gulls, pelicans, and herons, as well as seabirds such as the albatross, and even the penguin, but generally 'fowl' refers to birds used by humans.