A stocky duck with a thick neck and a heavy head with a sloping forehead and a stout bill. Males have a knob at the base of the bill. The wings are rather broad. The tail is fairly long and may be held upward out of the water.
Larger than an American Wigeon, smaller than a Common Eider.crow-sized
- Both Sexes
- Length: 18.9-22.8 in (48-58 cm)
- Weight: 33.5-63.5 oz (950-1800 g)
- Wingspan: 31.5 in (80 cm)