An adult brown skua (Stercorarius spp), with a stolen penguin egg at Barrientos Island, Antarctica, Polar Regions

Adult Subantarctic Skua (Catharacta antarctica lonnbergi) cleaning itself in glacier run off at Stromness Bay, South Georgia, Polar Regions

An adult brown skua (Catharacta antarctica) feeding on a dead elephant seal pup at St. Andrews Bay, South Georgia

Dead southern elephant seal (Mirounga leonina) pup being eaten by an Antarctic skua on South Georgia Island, Southern Ocean

Adult Arctic Skua (Stercorarius parasiticus), on ice floe in the Svalbard Archipelago, Norway, Arctic, Europe

Adult brown Skua (Catharacta antarctica), in flight near the Antarctic peninsula in the Southern Ocean, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

Adult great skua (Stercorarius skua) being harassed by Arctic terns (Sterna paradisaea) guarding their nest sites, Svalbard, Norway

Adult male Antarctic fur seal (Arctocephalus gazella) harassing a skua at Torgersen Island, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

An adult Brown Skua (Catharacta antarctica) near the Antarctic peninsula in the southern ocean

Sub-Antarctic Skua (Catharacta antarctica) vie for a fish head on Barrentos Island in the Aitcho Island Group, south Shetland Islands, Antarctica.

An adult Brown Skua (Catharacta antarctica) near the Antarctic peninsula in the southern ocean

Adult south polar skua (Catharacta skua maccormicki) on the wing and feeding after an iceberg break-up near Port Lockroy on the western side of the Antarctic Peninsula

Sub-Antarctic Skua (Catharacta antarctica) vie for a fish head on Barrentos Island in the Aitcho Island Group, south Shetland Islands, Antarctica.

Sub-Antarctic Skua (Catharacta antarctica) vie for a fish head on Barrentos Island in the Aitcho Island Group, south Shetland Islands, Antarctica.

Adult south polar skua (Catharacta skua maccormicki) on the wing and feeding after an iceberg break-up near Port Lockroy on the western side of the Antarctic Peninsula

Adult south polar skua (Catharacta skua maccormicki) on the wing and feeding after an iceberg break-up near Port Lockroy on the western side of the Antarctic Peninsula

An adult Brown Skua (Catharacta antarctica) near the Antarctic peninsula in the southern ocean

Adult south polar skua (Catharacta skua maccormicki) on the wing and feeding after an iceberg break-up near Port Lockroy on the western side of the Antarctic Peninsula