Other Names: none
Distribution: arctic coasts in summer; coasts worldwide in winter.
Size: 16-20 cm in length with a 38-42 cm wingspan.
Plumage: In summer, adults have rufous head and breast, white underside, and upperside heavily spotted with black and brown. In winter, the rufous areas are replaced by pale gray, and birds look almost uniform white. The legs, beak, and eyes are black.