The South Polar Skua looks like a bulky, broad-winged gull with a short, wedge-shaped tail. Adults have both dark and light morphs. The light morph is pale gray on the head, neck, and underparts. The upperparts are darker, with narrow, whitish streaks. The dark morph is uniformly dark grayish-brown above with a pale yellowish nape. Juveniles are darker than light-morph adults and range from dark brown to dark gray. In flight, the South Polar Skua has a hunchbacked appearance, blackish underwing coverts, and a white patch in the primaries.