Territorial display by a brown skua, Mangere Island.

The Brown Skua (Stercorarius antarcticus), also known as the Antarctic Skua, Southern Great Skua, Southern Skua, or Hākoakoa (Māori), is a large seabird that breeds in the subantarctic and Antarctic zones. When not breeding it often moves further north, particularly to subantarctic islands populated by burrow-nesting seabirds or penguins. It is highly predatory, feeding mainly on other birds but will also scavenge around fishing boats and ships and feed at sea. They nest on grass, gravel or bare rock, around October to November, when they become highly territorial aggressively defending their nesting area.