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...

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

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

Andrew Parkinson / Great skua (Stercorarius skua) territorial adult flying directly toward the photographer in a display of aggression. Shetland Islands, Scotland, UK, June. (non-ex)

Andrew Parkinson / Great skua (Stercorarius skua) attacking a sheep, in an attempt to prevent it wandering too close to its vulnerable chick. Shetland Islands, Scotland, UK, June (non-ex)

Andrew Parkinson / Great skua (Stercorarius skua) bathing in a freshwater pool. Shetland Islands, Scotland, UK, June. (non-ex)

Andrew Parkinson / Pair of Great skuas (Stercorarius skua) on a misty moorland with person walking close to their territory. Shetland Islands, Scotland, UK, June. (non-ex)

Andrew Parkinson / Breeding pair of Great skuas (Stercorarius skua) in a territorial display to warn off approaching Skuas, Shetland Islands, Scotland, UK, June. (non-ex)

Andrew Parkinson / Great Skua (Stercorarius skua) territorial adult displaying to other Skuas passing overhead by stretching out its wings and calling. Shetland Islands, Scotland, UK, June. (non-ex)

Jouan & Rius / Great Skua (Stercorarius / Catharacta skua) adult attacking to protect his chick, Shetland Islands, Scotland, UK