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...

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

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

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

Klein & Hubert / Young Eagle hunter (Berkutchi) with his Golden eagle (Aquila chrysaetos) portrait, Altai, Mongolia. Model released.

Klein & Hubert / Young Eagle hunter (Berkutchi) with his Golden eagle (Aquila chrysaetos) portrait, Altai, Mongolia. Model released.

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

Shane Gross / Clark's Anemonefish (Amphiprion clarkii) tending to her eggs. Kimbe Bay, Papua New Guinea

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

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.

Guy Edwardes / Dalmatian Pelican (Pelecanus crispus) portrait, close-up, Lake Kerkini, Greece

Markus Varesvuo / Red-throated Diver (Gavia stellata) portrait, Iceland, June.

Markus Varesvuo / Great grey owl (Strix nebulosa) Kuhmo, Finland, March.

Markus Varesvuo / Great Grey Owl (Strix nebulosa) Kuhmo Finland, March.

Markus Varesvuo / Goshawk (Accipiter gentilis) plucking a Willow Grouse (Lagopus lagopus) Liminka, Finland, March.

Markus Varesvuo / Black-throated Diver (Gavia arctica) Vaala Finland, June.

Andres M. Dominguez / Crested tit (Lophophanes cristatus) Sierra de Grazalema Natural Park. Southern Spain. September.

Andres M. Dominguez / Western yellow wagtail (Motacilla flava) perched on thistle, Andalusia. Spain. April

Andres M. Dominguez / Siberian tit (Poecile cinctus) perched, Ivalo, Finland. March

Andres M. Dominguez / Crested tit (Lophophanes cristatus) Sierra de Grazalema Natural Park. Southern Spain. July

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

Will Burrard-Lucas / White rhino (Ceratotherium simum), portrait. 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.

Nick Garbutt / American bison (Bison bison) female covered in hoar frost near hot spring, portrait. Midway Geyser Basin, Yellowstone National Park, USA. February.

Danny Green / Grizzly bear (Ursus arctos) running through water, portrait. Lake Clark National Park, Alaska, USA. September.

Alex Mustard / Green turtle (Chelonia mydas) resting on sea floor and two juvenile Golden trevally (Gnathanodon speciosus). Marsa El Shouna, Marsa Alam, Egypt.

Gabriel Rojo / Jaguar (Panthera onca) lying on tree roots, portrait. Mato Grosso, Pantanal, Brazil.

Ann & Steve Toon / RF - Lion (Panthera leo) head portrait at night, Zimanga private game reserve, KwaZulu-Natal, South Africa. (This image may be licensed either as rights managed or royalty free.)

Claudio Contreras / California condor (Gymnogyps californianus), portrait. California condor recovery program, Sierra de San Pedro Martir National Park, Baja California Peninsula, Mexico.

Eric Baccega / Lion (Panthera leo) male walking. Masai Mara National Reserve, Kenya.

Morley Read / Tropical flat snake (Siphlophis compressus) climbing on a flowering bromeliad (Aechmea) in the Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Leaf frog (Agalychnis hulli) blinking its eyes, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Map treefrog (Boana geographica) blinking, Amazon rainforest, Orellana Province, Ecuador.

Morley Read / Close-up portrait of a South American common toad (Rhinella margaritifera) amongst leaf litter, Orellana Province, Ecuadorian Amazon.

Morley Read / Opossum (Marmosa sp.) on the branch of a rainforest shrub at night, Pastaza Province, Ecuadorian Amazon.

Ingo Arndt / Close-up of a Guanaco (Lama guanicoe) feeding, Torres del Paine National Park, Patagonia, Chile, December.

Espen Bergersen / Killer whale / orca (Orcinus orca). Spyhopping very close, showing eye. Kvanangen, Troms, Norway. November

Heather Angel / Giant panda (Ailuropoda melanoleuca) portrait, in falling snow. Captive bred, in enclosure, Panda Breeding Centre, Wolong, Sichuan Province, China. February 2008.

Alex Mustard / RF - Portrait of Coral hermit crab (Paguritta harmsi) living in a hard coral colony. North Male Atoll, Maldives. Indian Ocean (This image may be licensed either as rights managed or royalty free.)

Alex Mustard / Portrait of a Giant frogfish (Antennarius commersoni) on a large Yellow elephant ear sponge (Ianthella basta). Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Alex Mustard / Portrait of a tarpon (Megalops atlanticus) on a coral reef. East End, Grand Cayman, Cayman Islands, British West Indies. Caribbean Sea.

Alex Mustard / Portrait of a male short snouted seahorse (Hippocampus hippocampus) in sea oak seaweed (Halidrys siliquosa). Devon, England, United Kingdom. British Isles. English Channel. North East Atlantic Ocean.

Alex Mustard / Orange painted frogfish (Antennarius pictus) fishing. Here the frogfish is illuminated by a snooted strobe and the background sand lit with a red LED torch. Bitung, North Sulawesi, Indonesia. Lembeh S...

Alex Mustard / Whitemargin stargazer (Uranoscopus sulphureus) sets an ambush in the sand at night. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Lucas Bustamante / Tropical shield mantis (Choeradodis sp.) Sumaco National Park, Napo, Ecuador

Lucas Bustamante / Green-crowned woodnymph (Thalaurania fannyi) Mashpi, Pichincha, Ecuador