Family STERCORARIIDAE. SKUAS.
Bill with a horny cere extending more than half the bill. Hind toe small. Anterior toes long and fully webbed. Claws strong, much curved, and sharp. Wings long and pointed, first quill longest. Tail long and rounded, with central pair projecting. Sternum with one-notch on each side of posterior margin. Gulllike birds that live mainly by robbing Gulls, Terns, and Petrels of their food. Plumage dark-coloured. Breed in high latitudes. Two eggs, olive, spotted brown.