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

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

An adult brown skua (Stercorarius spp) stealing a penguin egg at Brown Bluff, Antarctica, Polar Regions

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

Adult Antarctic skua (Stercorarius antarcticus), eating a gentoo penguin egg at Port Lockroy, Antarctica, Polar Regions

Brown skua (Stercorarius antarcticus) in flight, Southern Ocean, Polar Regions

An adult brown skua (Stercorarius antarcticus), harassing a gentoo penguin on Barrientos Island, Antarctica, Polar Regions

Adult brown skua (Stercorarius antarcticus), in flight in the Lemaire Channel, Antarctica, Polar Regions

A Brown Skua, Stercorarius antarcticus on the beach at Salisbury Plain, South Georgia, Southern Ocean.

Subantarctic Skua, Stercorarius antarcticus, displaying amid King Penguin colony, Aptenodytes patagonicus, Salisbury Plain, South Georgia, South Atlantic Ocean.

Subantarctic Skua (Stercorarius antarcticus) fighting over carcass. Salisbury Plain, South Georgia, South Atlantic Ocean.

On nest eating egg of Black-browed albatross (Thalassarche melanophris). Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Chick. Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Chick. Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Chick. Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Chick. Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Preying on Gentoo Penguins (Pygoscelis papua) hovering over colony.. Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January

Falkland Skua or Brown Skua (Stercorarius antarcticus, exact taxonomy is under dispute). They are the great skuas of the southern polar and subpolar region. South America, Falkland Islands, January