Other Names: none
Distribution: arctic tundra of North America and Asia in summer; North Pacific coasts in winter.
Size: 58-74 cm in length with a 110-128 cm wingspan, weighing 1-2.5 kg.
Plumage: Breeding adults have a matte gray head, the neck and back are black with white stripes, and the throat is black with purple tones. Non-breeding adulst are generally blackish above and white below, often showing a thin chin strap. The bill is black and the eyes are dark red.