Adult Description
- Small duck.
- Brown or gray overall.
- Large light blue patches on front of wing, visible in flight.
- Male with white crescent on face.
Male Description
Breeding (Alternate) Plumage: Blue-gray head with large white crescent behind bill. Cinnamon-brown body feathers, patterned with fine black marks. White patch on rear flank. Upper wing with light blue patch with white rear border. Back of wing iridescent green.
Eclipse (Basic) Plumage: Gray-brown overall, without white patches. Faint outline of white face crescent.Female Description
Gray-brown overall, with small white area at base of bill. Bill dark. Light blue upper wing patch with narrow white border. Back of wing mostly brown, with little green.Immature Description
Similar to adult female.