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|Ducks, geese and swans|
|Black-bellied Whistling Duck (Dendrocygna autumnalis)|
These birds are common and widespread, and live in or near water. The family has a cosmopolitan distribution, on all the world's continents except Antarctica and on most of the world's islands and island groups.
These are birds that are adapted through evolution[source?] for swimming, floating on the water surface, and in some cases diving. The family contains around 146 species in 40 genera. They are generally herbivorous, and are monogamous breeders. A number of species do annual migrations. A few species have been domesticated for agriculture, and many others are hunted for food and recreation. Five species have become extinct since 1600, and others are close to extinction.