Other Names: none
Distribution: Great Lakes and Hudson Bay regions in summer; coasts of the United States and Mexico in winter. A nonmigratory population exists in the Pacific Northwest.
Size: 37-46 cm in length with a 62-63 cm wingspan.
Plumage: Males have a black back and breast, a purple-glossed, black-appearing angular head, pale gray flanks, and a vertical white mark on the side of the breast. Females are brownish, paler around the base of the bill, with narrow white eye rings. The bill is pale gray with a white ring at the tip. The high angular shape of the head and white ring on the bill are indicative of the species.