Michael Pitts / Gentoo penguins (Pygoscelis papua) calling and defending their eggs from Southern Skua (Stercorarius antarcticus) hunting for unattended eggs or chicks, Sea Lion island, The Falklands, South Atlantic.

Andy Rouse / Lonnberg's / Subantarctic Skua (Stercoraius antarcticus lonnbergi) displaying aggressive behaviour, South Shetland Islands, Antarctica. (Non-ex)

Hanne & Jens Eriksen / Antarctic skua aggressive display. South Georgia {Stercorarius antarcticus}

Jessie Lane / Antarctic skua {Stercorarius antarcticus} South Georgia (Godthul harbour in background)

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick with South polar skua (Stercorarius maccormicki) in background, Atka Bay, Queen Maud Land, Antarctica.

Stefan Christmann / South polar skuas (Stercorarius maccormicki) Atka Bay, Queen Maud Land, Antarctica.

Stefan Christmann / South polar skua (Stercorarius maccormick) feeding on Emperor penguin (Aptenodytes forsteri) chick, Atka Bay, Queen Maud Land, Antarctica.

Stefan Christmann / South polar skua (Stercorarius maccormick) scavenging, Emperor penguin (Aptenodytes forsteri) chick, Atka Bay, Queen Maud Land, Antarctica.

Stefan Christmann / South polar skua (Stercorarius maccormick) feeding on Emperor penguin (Aptenodytes forsteri) chick, Atka Bay, Queen Maud Land, Antarctica.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) with South polar skua (Stercorarius maccormicki) Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / South polar skua (Stercorarius maccormicki) resting on ground, Atka Bay, Queen Maud Land, Antarctica. October.

Stefan Christmann / South polar skua (Stercorarius maccormicki) in flight, portrait. Atka Bay, Antarctica. March.