Northern Prairie Wildlife Research Center
Body: Medium-sized duck, 1 3/4 - 2 pounds, 15-18 inches long. Gray vermiculated back with white sides and belly. Head purple-black. Chest and rump black. Eyes yellow. Bill light blue, short and broad. Feet gray. Wings: Dark brown with white flecking on coverts and tertials. Speculum white. Voice: Purr. In Flight: Rapid wingbeat. Dark head and chest contrast with white belly.
Ranging from bluish brown to blotchy near-winter coloration. Belly whitish. Head dark with scattering of white at base of bill. Bill, eyes, feet and wings same as in winter.
Body: Dull brown with distinct white belly. Prominent white patch at base of bill. Eyes yellow. Bill and feet similar to male. Wings: Dark brown with minute white flecking on coverts. Speculum white. Voice: Purr or silent.