141935 Great Skua Stercorarius skua with Lesser Black-backed Gull. L 48-52cm. Bulky seabird. Gull-like but note large head, dark legs and dark bill. In flight, shows striking white wing patch. Part scavenger, part predator and food parasite of Gannet. Sexes are similar. Adult is brown with buff and golden-brown streaks. Juvenile is uniformly dark brown and rufous. Voice Mostly silent. Status Locally common summer visitor and passage migrant. Nests near seabird colonies in Scotland; Orkney and Shetland are strongholds. Passage birds invariably seen at sea.