Distribution: Kamchatka to the Sea of Okhotsk in the western Pacific Ocean. Winter in the seas around northern Japan with some reaching South Korea and southern Japan. Vagrants have been reported in North America and Europe.
Description: Measures about 25 cm in length; slender, black bill; pointed wings. Plumage varies by season. Non-breeding birds are generally white below with a black crown, nape, back and wings. Breeding birds are mostly brown with pale feather edges giving a scaly appearance. The central underparts are white.