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Duck. Duck is the representative birds of several genera of the family duck: Shelduck, sea ducks (Pochards), white-headed ducks, river ducks, ducks, ships, musk ducks and krohali; in total more than 110 species. Ducks are birds of medium and small sizes with a relatively short neck, covered in front with transverse flaps. Plumage varied, in many species on the wing there is a special speculum. For a number of species characterized by a pronounced in the breeding season, sexual dimorphism, manifested most often in a different plumage of male and female.