A heavyset seabird with a long, thick neck, blocky head, and heavy hooked bill. The legs are short, the tail fairly long, and the wings broad.
Adults are blackish overall with white throat and yellowish skin around the bill. When breeding, adults have a square patch of white on the thigh and white neck feathers. Juveniles are brownish with a whitish throat and belly, with some brownish streaking at the edges.
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