Common Scoter

Overview

The Common Scoter is a medium-sized sea duck native to northern Eurasia, closely related to and long considered the same species as the North American Black Scoter. Breeding males show completely black plumage without white markings, similar to the Black Scoter, differing mainly in the placement and shape of the yellow-orange bill coloring rather than in feather pattern. Females are brown with paler cheeks and throat contrasting against a darker cap, much like the Black Scoter.

Feather Identification

• Absence of white: Breeding males show entirely black body and head feathering, with no white patches, matching the pattern of the closely related Black Scoter.
• Female facial contrast: Females show a pale cheek and throat against a darker crown, similar to female Black Scoters, making the two species very difficult to separate by feather pattern alone.
• Range as identification context: Because feather patterns overlap almost completely with the Black Scoter, geographic range - Eurasia for Common Scoter versus North America for Black Scoter - is often the most practical way to assign a feather to one species or the other.
• Wing pattern: Wings are uniformly dark in both sexes, without a white speculum.
• Bill note: The male's bill shows a yellow-orange patch mainly along the top ridge rather than as a rounded knob, a subtle difference from the Black Scoter, though this is a bare-part rather than feather trait.

Plumage Notes

Breeding males are entirely black, closely matching the plumage of the Black Scoter. Females and immatures are brown with paler cheeks and throat contrasting against a darker cap. Eclipse plumage in males shows little change from breeding plumage. The species undergoes a complete molt after breeding with a flightless period. Juveniles resemble females and gradually acquire the male's all-black plumage.

Habitat & Range

Common Scoters breed on lakes and wetlands across northern Europe and Asia, nesting on the ground near water. In winter, they move to coastal ocean waters across temperate Europe, often forming large flocks along favored coastlines. The species is migratory, moving from northern breeding lakes to coastal wintering areas each year.

Behavior & Field Notes

Common Scoters dive to forage on aquatic invertebrates along the seafloor, typically in nearshore waters. They are gregarious in winter, forming large rafts along favored coastlines. Nesting occurs on the ground near lakes and wetlands, well hidden in vegetation. The species gives whistled calls during courtship, similar to the closely related Black Scoter, and flight is strong and direct, typically low over open water in loose flocks.