GADWALL is a widely distributed duck, occurring throughout Europe and North America, as well as in Asia and the north of Africa. It is a fresh-water species, and is remarkable for the great development of the comblike "teeth" at the margin of the bill. The gadwall,
Chaulelasmus streperus, is 20—22 inches long, generally grayish brown, finely mottled, with the wing coverts chestnut, the breast ringed with white, and the underside of the wing pure white, while the speculum of the drake is white edged with black. It breeds throughout the northern interior of North America.
