53 cm (21") Fairly common and widespread. Nests on lakes and ponds; winters along coasts, uncommon on Great Lakes. Largest scoter with a slightly rounded forehead.
Male: black head has white "teardrop" below white eye; bill orange at tip with black knob at base; black neck and body with white wing patch, not always visible when wings are closed.
Female: large dark bill; may have two white facial spots; all grayish-brown with a white wing patch, not always visible when wings are closed.
In flight: all dark with bright white speculum; migrates in long line formations.
Song: bell-like notes, thin whistling note.