Heather Angel / Giant panda (Ailuropoda melanoleuca) sliding down slope on back after losing footing. Panda Breeding Centre, Wolong, Sichuan, China. January 1987.

Richard Sidey / Extreme close-up of a Humpback whale (Megaptera novaeangliae), with eye looking directly at the camera as the whale turns, 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 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.

Doug Gimesy / Eastern grey kangaroo (Macropus giganteus) on the burnt grounds of Wallabia Wildlife Shelter. The shelter was destroyed during the 2019/20 bushfires. This male kangaroo (called 'Link') was one...

John Shaw / Grey wolf in snow (Canis lupus), Minnesota, USA. January. Controlled situation.

John Shaw / Grey wolves running in snow (Canis lupus), Minnesota, USA. January. Controlled situation.

Danny Green / Roe Deer (Capreolus capreolus) in snow. Flatanger, Norway, January.

Danny Green / Red Deer Stags (Cervus elaphus) fighting amongst the bracken. Bradgate Park, Leicestershire, UK, October.

Danny Green / Red Deer Stag (Cervus elaphus) roaring. Bradgate Park, Leicestershire, UK, October.

Danny Green / Mountain hare (Lepus timidus) resting Cairngorms, Scotland, March

Danny Green / European Brown Bear (Ursus arctos) reflected in forest pond in evening mist, Finland, June

Danny Green / Brown Bear (Ursus arctos) in the forest, Finland, June

Alex Mustard / Dugong (Dugong dugon) male, swims over seagrass meadow (Halophila stipulacea) accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Dugong (Dugong dugon) male feeding on a seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / Dugong (Dugong dugon) male feeding on a seagrass meadow (Halophila stipulacea), accompanied by a young Golden trevally (Gnathanodon speciosus). Marsa Nabaa, Marsa Alam, Egypt. Red Sea

Alex Mustard / RF - Pod of Spinner dolphins (Stenella longirostris) cruise in formation over the sand of a lagoon while sleeping. Egypt. Red Sea (This image may be licensed either as rights managed or royalty free.)

Klein & Hubert / Harvest mouse (Micromys minutus) in cornfield with Poppies (Papaver rhoeas) in summer, France, Controlled conditions.

Klein & Hubert / Harvest mouse (Micromys minutus) in cornfield with Poppies (Papaver rhoeas) in summer, France, Controlled conditions.

Klein & Hubert / Harvest mouse (Micromys minutus) climbing between grass stems in summer, France, Controlled conditions.

Klein & Hubert / Harvest mouse (Micromys minutus) climbing between grass stems in summer, France, Controlled conditions.

Doug Gimesy / Koala (Phascolarctos cinereus) mother and joey are released by Emily Cordy (left/green clothes) - a Forest and Wildlife officer (and assisted by members from the Australian Defence Force) at Log Cros...

Doug Gimesy / Long-nosed potoroo (Potorous tridactylus) portrait showing sharp curved claws on front feet for foraging, Victoria, Australia. Controlled conditions.

Erlend Haarberg / Moose (Alces alces), calves near house in winter, Jokkmokk, Sweden, February.

Erlend Haarberg / Red fox (Vulpes vulpes), on spring snow, Vauldalen, Norway, April.

Erlend Haarberg / Arctic fox (Vulpes lagopus), Dovrefjell-Sunndalsfjella National Park, Norway, April.

Erlend Haarberg / Svalbard reindeer (Rangifer tarandus platyrhynchus), Svalbard, Norway, September.

Erlend Haarberg / Mountain hare (Lepus timidus) in spring outside a Norwegian house, Vauldalen, Norway, May.

Erlend Haarberg / Mountain hare (Lepus timidus) in spring, Vauldalen, Norway, May.

Erlend Haarberg / Muskox (Ovibus moschatos) males, Dovrefjell-Sunndalsfjella National Park, Norway, February.

Philippe Clement / Leucistic white lions (Panthera leo krugeri) male and juveniles, Captive.

Bence Mate / European rabbits (Oryctolagus cuniculus) fighting each other, Kiskunsag National Park, Hungary. June. Winner, General Fauna Category, 2019 Cadiz Photo Nature Competition.

Andy Rouse / African lion (Panthera leo) female carrying young cub, Masai Mara, Kenya, Africa. Highly commended in the African Wildlife Category of the Nature's Best Photography Competition 2019.

Diane McAllister / Polar bears (Ursus maritimus) fighting in water. Beaufort Sea , Kaktovik Alaska. USA. Highly commended in the Polar Passion category of the Nature's Best Photography Competition 2019.

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

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

Andres M. Dominguez / European hare (Lepus europaeus), Danube Delta, Romania. July.

Andres M. Dominguez / Golden jackal (Canis aureus) pup sitting on a grassy verge by a path, Danube Delta, Romania, July.

Andres M. Dominguez / Three juvenile Golden jackal (Canis aureus) pups running across a path, Danube Delta, Romania, July.

Will Burrard-Lucas / Black rhinoceros (Diceros bicornis) mother and calf, Lewa & Borana Conservancy, Kenya.

Will Burrard-Lucas / White rhino (Ceratotherium simum) female and juvenile, Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam.

Will Burrard-Lucas / White rhinoceroses (Ceratotherium simum) with calf playing with adult, Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam.

Will Burrard-Lucas / White rhino (Ceratotherium simum), portrait. Solio Game Reserve, Solio Ranch, Kenya. Taken with remote camera buggy / BeetleCam.