Other Names: none
Distribution: boreal forests throughout the Northern Hemisphere in summer; Northern Hemisphere coasts in winter.
Size: 51-58 cm in length with a 75-85 cm wingspan.
Plumage: Males are black with bold white wing patches, white crescents around the eyes, and a yellow bill with a black knob at the base. Females are dull brown, with two off-white facial spots and white wing patches. The eyes are bright white.