One of the largest ducks, mallards range across the entire northern hemisphere, and are probably the best known of all waterfowl, likely to set down in migration on small pools in city parks. It has also been widely domesticated or semidomesticated.

Its coloration makes identification easy, and the loud quack helps identify it. The birds breed in prairie waterholes in Canada, the Dakotas, Minnesota, and, to a minor extent, in other northern States. They move with the great spring and fall migrations and, adjusting easily to the presence of man, are likely to be seen in town or city. Add the domesticated mallards that swim about in so many parks and you have the most urbanized of the ducks that can still claim a wild heritage. They are most abundant in the Mississippi Valley.