Body: Large duck, 2 1/2 - 3 pounds, 24-28 inches long. Dark sooty appearance with lighter head. Bill of male yellow to greenish yellow; female bill greenish olive with blotches. Feet orange to reddish orange. Wings: Dark with purplish blue speculum bordered with black bars on leading and trailing edges. Voice: Female, loud quack; male, low raspy rink. In Flight: Black body contrasts with white underwings.