In a world where male ducks sport gleaming patches of green, red, or blue, the Gadwall’s understated elegance can make this common duck easy to overlook. Males are intricately patterned with gray, brown, and black; females resemble female Mallards, although with a thinner, darker bill. We don’t tend to think of ducks as pirates, but Gadwall often snatch food from diving ducks as they surface. This widespread, adaptable duck has dramatically increased in numbers in North America since the 1980s.
Look for Gadwall on small bodies of water with plenty of aquatic vegetation; Gadwall often feed in slightly deeper water than other dabbling ducks. They associate with many other duck species, and on a quick scan you may miss the males because of their subdued brown appearance—keep an eye out for their black rear ends, white wing-patch (formed by the inner secondary feathers), and intricately patterned, not streaked or spotted, plumage.
Information from the All About Birds website, , © Cornell Lab of Ornithology.