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

Danny Green / North American river otter (Lontra canadensis) on back, rolling on snow bank. Yellowstone National Park, USA, January.

Danny Green / Bengal tiger (Panthera tigris tigris) resting on track. Bandhavgarh National Park, India, December.

Danny Green / Bengal tiger (Panthera tigris tigris) male resting in undergrowth, portrait. Bandhavgarh National Park, India, December.

Danny Green / Reindeer (Rangifer tarandus) hunkering down in snow during blizzard. Svalbard, Norway, April.

Lucas Bustamante / Sri Lankan leopard (Panthera pardus kotiya) rolling on its back, Yala National Park, Sri Lanka

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chicks lying down in the cold, Atka Bay, Queen Maud Land, Antarctica. October.

Nick Hawkins / Galapagos sea lion (Zalophus wollebaeki), three resting underneath school bus. Isabela Island, Galapagos. 2017.

Karine Aigner / Bengal tiger (Panthera tigris tigris) head, close up. Ranthambore National Park, Rajasthan, India.

Mark Taylor / Yellow Labrador Retriever puppy, age 9 weeks, lying with head up.

Mark Taylor / Tabby kitten, 6 weeks, lying with head up and raised paw.

Pal Hermansen / Inuit sled dogs resting, near Ittoqortoormiit, Scoresbysund, Greenland. Second Prize in the Nature category of the Spider Black and White Photography Competition 2015.

Dave Watts / Female Western grey kangaroo (Macropus fuliginosus) rolling with a large joey in her pouch, Kangaroo Island, South Australia.

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Gizmo' aged 2 years lying on the forest floor. Gombe National Park, Tanzania.

Espen Bergersen / Svalbard reindeer (Rangifer tarandus platyrhynchus) rear view lying down, resting at sunset, Svalbard, Norway. April.

Roy Mangersnes / Juvenile female Polar bear (Ursus maritimus) lying down protecting a seal carcass at sunset, Svalbard, Norway, March.

Anup Shah / Cheetah (Acinonyx jubatus) male juvenile aged about 18 months approaching a kill, wide angle view. Maasai Mara National Reserve, Kenya.

Enrique Lopez-Tapia / Man feeding Hyaenas (Crocuta crocuta) at night in Harar City, this has been a tradition for several centuries, and has now become a show for tourists. Ethiopia, November 2014

Enrique Lopez-Tapia / Man feeding Hyaenas (Crocuta crocuta) at night in Harar City, this has been a tradition for several centuries, and has now become a show for tourists. Ethiopia, November 2014

Cyril Ruoso / Bonobo (Pan paniscus) newborn baby sleeping next to mother, Lola Ya Bonobo Sanctuary, Republic of the Congo. Non-ex

Cyril Ruoso / Giant panda (Ailuropoda melanoleuca) mother and young playing, captive, Sichuan, China. Non-ex

Cyril Ruoso / Bonobo (Pan paniscus) male and female copulating, Lola ya Bonobo Sanctuary, Democratic Republic of Congo

Theo Webb / Bonobo (Pan paniscus) lying in a day nest, Max Planck research site, LuiKotale, Salonga National Park, Democratic Republic of Congo.

Theo Webb / Female Bonobo (Pan paniscus) tickling her infant, Max Planck research site LuiKotale, Salonga National Park, Democratic Republic of Congo.

Solvin Zankl / Black backed jackal (Canis mesomelas) attacking Cape fur seal (Arctocephalus pusillus) pup, Sperrgebiet National Park, Namibia, December. Sequence 3/6

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month cubs with mother 'T19 Krishna' in background, Ranthambhore National Park, India.

Hugh Pearson / Leopard (Panthera pardus) resting, Erindi Game Reserve, Namibia.

Paul Hobson / Otter (Lutra lutra) female grooming in seaweed, Mull, Scotland, UK, September.

Olga Kamenskaya / Baikal seals (Pusa sibirica) hauled out on rock. Endemic to Lake Baikal. Russia, May.

Fred Olivier / Adelie penguin (Pygoscelis adeliae) lying down to incubate an egg, Antarctica.

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) mother lying on back and holding baby age one year. Parc National des Volcans, Rwanda. Endangered species

Jabruson / Angelique Todd with veterinarians during the anaesthesia of 'Blackback' Western Gorilla (Gorilla gorilla) 'Ngobo'. Gorilla anaesthetised by veterinary team in order to remove wire snare from wrist. Mo...

Jabruson / Dying African forest elephant (Loxodonta africana cyclotis), shot and wounded by poachers, near Lokoue Bai. Odzala-Kokoua National Park, Republic of Congo.

Jabruson / Long-tailed Pangolin (Uromanis tetradactyla) unfurling itself from protective posture, Lokoue Bai. Odzala-Kokoua National Park, Republic of Congo

Charlie Summers / Black Bear (Ursus americanus) sleeping in a Sitka Spruce tree (Picea sitchensis) alongside Anan Creek, Alaska, July.

Fiona Rogers / Sumatran orangutan (Pongo abelii) mature male 'Halik' aged 26 years lying down - portrait. Gunung Leuser National Park, Sumatra, Indonesia. Apr 2012. Rehabilitated and released (or descended from thos...

Denis-Huot,Denis-Huot / Lion (Panthera leo) cubs playing, Masai-Mara Game Reserve, Kenya

Eric Baccega / Grizzly bear cub (Ursus arctos horribilis) resting in the sedges, Khutzeymateen Grizzly Bear Sanctuary, British Columbia, Canada, June.

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile spreading body weight over thin newly forming pack ice, trying not to break through, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North...

Steven Kazlowski,Steven Kazlowski / Polar bear (Ursus maritimus) juvenile rolling around on newly formed pack ice, Beaufort Sea, off the 1002 area of the Arctic National Wildlife Refuge, North Slope, Alaska

John Downer / Bengal Tiger (Panthera tigris tigris) mother and cub, Pench National Park, Madhya Pradesh, India, taken on location for 'Tiger - Spy in the Jungle'

Petra Wegner / Siberian Husky, puppy, 11 weeks, lying down.

Nick Garbutt / RF- Young Ring-tailed lemurs (Lemur catta) carried on mother's back, Madagascar. (This image may be licensed either as rights managed or royalty free.)

Terry Whittaker / 2020VISION / Red deer (Cervus elaphus) stag lying down in mist at sunrise, Bushy Park, London, UK, October

Diane McAllister / Wild stallion (Equus caballus) lying down in the sagebrush and yawning. The foothills south of Reno, Nevada, USA, May.

Fiona Rogers / Bornean Orang-utan (Pongo pygmaeus wurmbii) female baby 'Petra' aged 12 months hanging upside down from her mother. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia, Ju...

Aflo / Portrait of young boy lying down with Longhaired Dachshund

Juan Carlos Munoz / Magellanic penguin (Spheniscus magellanicus) flapping its wings, with another lying down. Puerto Deseado, Patagonia, Argentina, Nov 2008