Black Scoter

Identification

The Black Scoter is a large, robust sea duck measuring 43 to 49 centimetres in length, characterised by its bulky build and notably large bill. Adult males are unmistakably all black plumage, with a distinctive very bulbous bill that is mostly yellow—a striking feature that makes them immediately recognisable. Females are brown birds with pale cheeks, which can appear similar to female Common Scoters, though Black Scoters display more extensive pale areas on the female. A diagnostic field mark of the drake is a characteristic downward head movement when stretching the wings. Unlike some other scoter species, male Black Scoters lack any white markings on their plumage.

Range & Habitat

Black Scoters breed across the far north of North America, from Labrador and Newfoundland to regions southeast and northwest of Hudson Bay, with additional populations occurring on the Siberian side of the Bering Straits east of the Yana River. During winter, the species moves farther south to temperate coastal zones, inhabiting the coasts of the northern United States and Canada. On the Pacific coast, they range south to the San Francisco Bay region, while Atlantic populations extend to the Gulf of Mexico coast. Asiatic populations winter as far south as China. Some individuals may over-winter on the Great Lakes. The species is a very rare vagrant to western Europe, where only males can be safely identified in the field, making female vagrants likely to go undetected.

Behaviour & Diet

Black Scoters are highly specialised diving ducks that feed opportunistically depending on their location and season. On coastal waters during migration and winter, they dive for crustaceans and molluscs. When nesting on freshwater habitats, their diet shifts to include insects and their larvae—particularly caddisflies—fish eggs, and occasionally vegetation such as duckweed. In winter quarters, the species is notably gregarious, forming large, tightly packed flocks on suitable coastal waters; these flocks tend to take off together as a unit. In the breeding season, birds are less social. The species appears to favour sheltered embayments and waters with mixed depths.

Best Time & Places to See It

Winter is the most productive season for encountering Black Scoters, when they congregate in large flocks along northern North American coasts. Pacific coast observers should focus on coastal waters south to the San Francisco Bay region, while Atlantic coast birders can find them along the Atlantic and Gulf of Mexico coasts. Northern US and Canadian coastal regions offer the most reliable viewing opportunities. The Great Lakes provide occasional over-wintering birds. Black Scoters nest later than most other North American ducks, so breeding season sightings in their far northern range require travel to remote regions such as Labrador, Newfoundland, and Hudson Bay areas.

Photography Tips

Photographing Black Scoters is most rewarding in winter when large flocks congregate in accessible coastal locations. The striking contrast of the male's all-black plumage against water makes for compelling images, particularly when the distinctive yellow bill catches the light. Capture males performing their diagnostic downward head movement during wing-stretching, a behaviour that provides both natural-looking poses and confirms species identification. Winter coastal habitats offer good opportunities for approach, though the species' tendency to take off en masse means patience and distance are essential. The pale-cheeked females and juveniles offer more subtle photographic challenges but are rewarding subjects for detailed documentation.