Black Scoter

The Black Scoter (Melanitta americana) is a medium-sized sea duck representing one of the classic "diver" species of the northern hemisphere. Unlike other scoter species that feature white plumage markings, the adult male Black Scoter is completely black except for its conspicuous, colorful bill. These ducks are highly gregarious during the winter months, forming dense, bobbing flocks called rafts along ocean coastlines. Because they frequently feed in the turbulent zone just beyond the breaking surf, they are a common and hardy fixture of cold Atlantic and Pacific waters.

Identifying Black Scoters relies on silhouette, plumage details, and head coloration. Unlike the other North American scoters, they lack white wing patches in all plumages.

• Adult Males: Entirely velvety jet-black plumage. The most defining feature is the swollen, bright orange-yellow knob at the base of the bill, leading to the colloquial name "butter-bill." These colors contrast sharply with the dark face.
• Adult Females: Uniformly dark grayish-brown body with a dark crown. The lower half of the face (cheeks, chin, and throat) is a contrasting pale dusky gray-white. This two-toned head pattern is a key identifying mark, giving them an appearance superficially similar to a female Ruddy Duck, though much larger.
• Immature Birds: Closely resemble adult females, but with lighter belly plumage and less definition on the cheeks.
• In Flight: Look for a completely dark wing profile on both the upper and lower surfaces, showing no white patches (distinguishing them from White-winged Scoters). The underwing flight feathers appear paler silver-gray against the dark body. Additionally, during flight, their rapid wing beats produce a continuous, high-pitched whistling sound.

The Black Scoter splits its life between two distinctly different ecological biomes:

• Breeding Season: They migrate to subarctic tundra and the northern limits of the boreal forest, primarily in Alaska and northeastern Canada. They nest near shallow, freshwater lakes, wetlands, and slow-moving rivers that provide an abundant supply of aquatic larvae and insects.
• Wintering Season: Strictly marine. From late autumn through early spring, they occupy coastal ocean waters, shallow bays, and estuaries along the Atlantic coast (from Atlantic Canada south to the Carolinas) and the Pacific coast (from the Aleutian Islands south to southern California). Under extreme weather conditions, some may winter on the Great Lakes.

Migration occurs in large nocturnal flocks, often far out at sea or high over land, tracking waterways where possible.

Black Scoters exhibit fascinating behaviors, particularly during winter and the early spring courtship period.

• Vocalization: This is the most vocal of the scoters. Males produce a constant, musical, melancholy whistling call that sounds like "cour-loo" or "cooo-cooo." When many males are calling together in a winter raft, the sound is often compared to a distant, squeaky wheel and can easily be heard over the sound of crashing surf.
• Foraging: They dive to find food, using their feet to propel themselves underwater. In winter, they feed heavily on benthic invertebrates, particularly mussels, clams, and small crabs. Their powerful gizzards allow them to crush thick mollusk shells. In freshwater breeding areas, their diet shifts toward aquatic insects and small fish.
• Courtship and Nesting: Courtship displays are energetic, with males bowing, arching their necks, and rushing across the water surface to impress females. Once paired, the female builds a cup nest on the ground, highly concealed under dense vegetation or low shrubbery near water. She lines it with grass and her own soft down feathers.