Also called bonxie. any of several large brown gull-like predatory birds of the genus Catharacta, related to jaegers, especially C. skua(great skua) of colder waters of both northern and southern seas.
The use of great skua pellets as indicators of plastic pollution in seabirds.
British Dictionary definitions for great skua
any predatory gull-like bird of the family Stercorariidae, such as the great skua or bonxie (Stercorarius skua) or arctic skua (S. parasiticus) both of which harass terns or gulls into dropping or disgorging fish they have caught
C17: from New Latin, from Faeroese skūgvur, from Old Norse skūfr