Richard Sidey / Drone shot of four Humpback whales (Megaptera novaeangliae) bubble-net feeding, cooperatively hunting Krill (Euphausiidae), Antarctic peninsula.

Richard Sidey / Drone shot of five Humpback whales (Megaptera novaeangliae) bubble-net feeding, cooperatively hunting Krill (Euphausiidae), Antarctic peninsula.

Richard Sidey / Drone shot of four Humpback whales (Megaptera novaeangliae) bubble-net feeding, cooperatively hunting Krill (Euphausiidae), Antarctic peninsula.

Richard Sidey / Drone shot of two Humpback whales (Megaptera novaeangliae) bubble-net feeding, cooperatively hunting Krill (Euphausiidae), Antarctic peninsula.

Chadden Hunter / Canadian timber wolf / Northwestern wolf (Canis lupus occidentalis) pack moving through snow, Wood Buffalo National Park, Alberta, Canada. Taken on location for BBC Frozen Planet, March 2009.

Jack Dykinga / Arizona sycamore (Platanus wrightii) roots and leaves amongst pebbles. In riparian area, Chiricahua Mountains, Coronado National Forest, Arizona, USA. November.

John Cancalosi / Juvenile Timber rattlesnakes (Crotalus horridus) massed together at nest site, Pennsylvania, USA.

John Cancalosi / Timber rattlesnakes (Crotalus horridus) at nest site with young, Pennsylvania, USA.

John Cancalosi / Corn snake (Pantherophis guttatus) young hatching, captive. Maryland, USA.

Sven Zacek / Aerial view of a small forest lake in Karula National Park, Valgamaa county, Southern Estonia. Highly commended in the Wildlife Photographer of the Year Awards 2019.

Ismaele Tortella / Eurasian otter (Lutra lutra) hunting in a shoal of Atlantic herring (Clupea harengus), northern Norway, March

Ismaele Tortella / Northern gannet (Morus bassanus) colony, chick climbing back into nest, with the midnight sun, Norway, July

Ismaele Tortella / White tailed eagle (Haliaeetus albicilla) catching fish, Lofoten, Norway, August.

Ismaele Tortella / Four Eurasian elk (Alces alces) walking through vegetation , Norway, August

Ismaele Tortella / Svalbard reindeer (Rangifer tarandus platyrhynchus) feeding in snow, Svalbard, Norway, March.

Ismaele Tortella / Black-legged kittiwake (Rissa tridactyla) nesting above a window, Lofoten, Norway, August.

Ismaele Tortella / Tracking shot of a Whooper swan (Cygnus cygnus) family walking, Lofoten, northern Norway, August.

Ismaele Tortella / Reindeer (Rangifer tarandus), Kvaloya island, Tromso, Norway, November.

Ismaele Tortella / Three Rock ptarmigan (Lagopus muta) feeding in winter plumage, city of Tromso in the background, northern Norway, March 2019.

Ismaele Tortella / Aerial tracking shot over Tromso in the winter, northern Norway, March 2019.

Andres M. Dominguez / Dead Lang's short-tailed blue butterfly (Leptotes pirithous) in a river with bacterial film, Los Alcornocales Natural Park, Southern Spain, September.

Andres M. Dominguez / Dead Lang's short-tailed blue butterfly (Leptotes pirithous) in a river with bacterial film, Los Alcornocales Natural Park, Southern Spain, September.

Sergio Hanquet / Green sea turtle (Chelonia mydas), two viewed from above. Tenerife, Canary Islands.

Danny Green / Polar bear (Ursus maritimus) resting on sea ice, view from above. Svalbard, Norway, June 2018.

Fred Olivier / Aerial shot of Castleton Tower at sunset, Castle Valley, Moab, Utah, USA, 2018.

Fred Olivier / Aerial shot tracking through the Corona Arch, Moab, Utah, USA, 2018.

Fred Olivier / Watchman goby (Cryptocentrus cinctus) and alpheid shrimp mutualism, the goby keeps watch while the shrimps dig and clean a shared burrow in the sand, Uepi Island, Solomon Islands.

Fred Olivier / Common reef octopus (Octopus cyanea) hunting, with Coral trout (Plectropomus) following to pick up scraps, Uepi Island, Solomon Islands.

Fred Olivier / Tracking shot of a Common reef octopus (Octopus cyanea) hunting, changing colour for camouflage, and wrapping coral heads to capture prey, Uepi Island, Solomon Islands.

Fred Olivier / Orange clownfish (Amphiprion percula) living in association with a Haddon's sea anemone (Stichodactyla haddoni), Marovo Lagoon, Solomon Islands.

Fred Olivier / Clark's anemonefish (Amphiprion clarkii) and Three spot damselfish (Dascyllus trimaculatus) swimming around anemone (Stichodactyla), Nusatupe Lagoon, Solomon Islands.

Fred Olivier / Two Black flying foxes (Pteropus alecto) venting in a tree, Ord river, Kimberley, Western Australia, Australia.

Fred Olivier / Male Great bower bird (Chlamydera nuchalis) adjusting bower, Kimberley, Western Australia, Australia.

Fred Olivier / Close-up shot tracking down a meltwater waterfall emerging from a glacier, Brasvellbreen Glacier, Magdalena Fjord, Svalbard, Norway, 2016.

Fred Olivier / Wide shot of the terminus of Brasvellbreen Glacier, with meltwater waterfall, Svalbard, Norway, 2016.

Fred Olivier / Tracking shot of a Brunnich's guillemot (Uria lomvia) breeding colony, nesting on cliff ledges, Alkefjellet, Svalbard, Norway.

Fred Olivier / Brunnich's guillemot (Uria lomvia)?nesting on cliff ledges, Alkefjellet, Svalbard, Norway.

Fred Olivier / Alkefjellet cliffs at dusk, with Brunnich's guillemot (Uria lomvia) breeding colony, Alkefjellet, Svalbard, Norway, 2016.

Fred Olivier / Polar bear (Ursus maritimus) walking on melting pack ice, Svalbard, Norway.

Fred Olivier / Tracking shot of large numbers of Brunnich's guillemots (Uria lomvia) on the water and in flight, Alkefjellet, Svalbard, Norway, 2016.

Fred Olivier / Tracking shot of a Brunnich's guillemot (Uria lomvia) breeding colony, Alkefjellet, Svalbard, Norway, 2016.

Neil Anderson / Red squirrel (Sciurus vulgaris), two curled up asleep in drey inside nest box. Nest of lichen and Pine needles. Highlands, Scotland, UK.

Fred Olivier / Close-up of a Common jellyfish (Aurelia aurita), Prince William Sound, Alaska, USA.

Fred Olivier / Close-up of a Northern sea otter (Enhydra lutris kenyoni) sleeping, with paws over eyes, Kachemak Bay, Alaska, USA.

Fred Olivier / Tawny hermit crab (Coenobita rugosus) emerging from its shell, Christmas Island, Indian Ocean, Australian Territory.

Tony Wu / Bowhead whale (Balaena mysticetus), group socialising in shallow water, aerial view. Part of larger group of more than 50 whales congregating, Sea of Okhotsk sub-population, Russia.

Joris van Alphen / Aerial view of clearing with felled logs in Bialowieza Forest UNESCO World Heritage Site, Poland. Highly commended in the Wildlife Photojournalism Category of the Wildlife Photographer of the Year Awa...

Morley Read / Leaf cutter ants (Atta sp) carrying leaves and pieces of yellow flowers along a branch, Amazon rainforest, Orellana Province, Ecuador.