A stocky, medium-sized seaduck with a short tail, rounded head, and a broad bill that does not slope up to the forehead, as the Surf Scoter's bill does. Male Black Scoters have a rounded knob at the base of the bill.
Larger than a Long-tailed Duck, smaller than a White-winged Scoter.crow-sized
- Length: 16.9-19.3 in (43-49 cm)
- Weight: 30.4-38.8 oz (862-1100 g)
- Wingspan: 27.6-28.4 in (70-72 cm)