Other Names: none
Distribution: northern freshwater habitats in summer; northern coasts in winter.
Size: 40-46 cm in length with a 58-62 cm wingspan.
Plumage: In breeding plumage, both sexes are generally black with a rufous neck, black cap, white cheeks, and a long, pointed yellowish bill. In winter, they are mainly gray, with paler cheeks and a pale bill. The eyes are dark red to black.