The South Polar Skua (Stercorarius maccormicki) is a large seabird in the skua family Stercorariidae. An older name for the bird is MacCormick’s Skua, after explorer and naval surgeon Robert McCormick, who first collected the type specimen.
The South Polar Skua breeds throughout the Antarctic coast, especially in the Ross Sea area. It undergoes a transequatorial migration, wintering as far north as Alaska and Greenland.
Text from Wikipedia: http://en.wikipedia.org/wiki/South_Polar_Skua
Text from IUCN Red List: http://www.iucnredlist.org/details/106003199/0