Ole Jorgen Liodden / Arctic skua (Stercorarius parasiticus) in flight, Svalbard, Norway, August.

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.

David Tipling / Great Skua (Stercorarius skua) in flight low over water, Fetlar, Shetland, June

Danny Green / Great skua (Stercocarius skua) in flight over Gannet (Morus bassanus) colony, looking for small chicks, whilst Gannets call defensively, Shetland Isles, July. Bookplate from Danny Green's 'The Long Jo...

Ole Jorgen Liodden / Brown Skua (Stercorarius antarcticus) bathing, Auckland Islands. New Zealand. November.

Staffan Widstrand / Polar Bear (Ursus maritimus) mobbed by possibly a Skua, Svalbard, Norway, July

Ole Jorgen Liodden / Brown Skua (Stercorarius antarcticus) bathing, Auckland Islands. New Zealand. November.

Peter Cairns / 2020VISION / Great skua (Stercorarius skua) displaying, Shetland Isles, Scotland, UK, July

Peter Cairns / 2020VISION / Great skua (Stercorarius skua), Shetland Isles, Scotland, UK, July

Loic Poidevin / Arctic Skua (Stercorarius parasiticus) calling. Handa Island, Scotland, June.

Ole Jorgen Liodden / Pomarine Skua / Jaeger (Stercorarius pomarinus) in flight. Nordaustlandet, Svalbard, September.

Alex Mustard / 2020VISION / Great skua (Stercorarius skua) on water, Shetland Islands, Scotland, UK, April