2. A diverse family, the Anatidae, including ducks, geese, and swans.
There are said to be 145 species of small to large water birds (Anseriformes), that exist in freshwater and coastal marine habitats.
They feed on a wide variety of plants and animals; most of them are monogamous and are solitary during breeding. They nest on the ground or in trees and some are important as game birds or domesticated fowl.