Mallards are large ducks with hefty bodies, rounded heads, and wide, flat bills. Like many “dabbling ducks”, the body is long and the tail rides high out of the water, giving a blunt shape. In flight, their wings are broad and set back toward the rear. Male Mallards have a dark, iridescent-green head and bright yellow bill. The grey body is sandwiched between a brown breast and a black rear. Females and juveniles are mottled brown with orange-and-brown bills.