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Arctic Skua Stercorarius parasiticus L 46cm. Aerobatic, graceful seabird with deep wingbeats and narrow, pointed wings. Food parasite of Arctic Tern and Kittiwake. Adult has wedge-shaped tail and pointed streamers. Sexes are similar but adults occur in two morphs. Adult pale phase has white neck, breast and belly, dark cap and otherwise grey-brown plumage. Note faint yellowish flush on cheeks. Adult dark phase is uniformly dark grey-brown. Juvenile is dark rufous brown. Voice Utters nasal calls near nest. Status Local summer visitor to Scottish coasts; coastal passage migrant elsewhere.