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.

Chase Dekker / African Lion (Panthera leo) cub, Masai Mara, Kenya

Juergen & Christine Sohns / African Lion (Panthera leo) six week old cubs, Tswalu Game Reserve, South Africa

Juergen & Christine Sohns / African Lion (Panthera leo) six week old cub, Tswalu Game Reserve, South Africa

Nick Garbutt / Western red panda (Ailurus fulgens fulgens) climbing in tree. Singalila National Park, India / Nepal border.

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

Gabriel Rojo / Guanaco (Lama guanicoe) female and newborn baby, nose to nose in grassland. La Pampa Province, Argentina.

Oscar Dewhurst / Mute swan (Cygnus olor), two cygnets sheltering under parent's wing. Richmond Park, London, England, UK. April.

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.)

Ernie Janes / Celebes crested macaque (Macaca nigra) infant, captive.

Suzi Eszterhas / Leopard (Panthera pardus) six-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) six-week-old cub nuzzling mother, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) mother playing with her six-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub playing with mother's tail, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) mother and five-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) mother grooming five-week-old cub, Jao Reserve, Botswana

Suzi Eszterhas / Leopard (Panthera pardus) five-week-old cub playing with mother, Jao Reserve, Botswana

Nick Hawkins / Grey seal (Halichoerus grypus) opening mouth close up off Bonaventure Island, Gulf of Saint Lawrence, Quebec, Canada. September.

Bernard Castelein / Rhesus macaque (Macaca mulatta), mixed group of female and juveniles, walking along a track, Keoladeo National Park, Bharatpur, India

Suzi Eszterhas / Chinese pangolin (Manis pentadactyla), orphaned baby in arms of research assistant. Taipei Zoo, Taipei, Taiwan. 2015. Captive. Model released.

Willi Rolfes/ BIA / Alpine Marmot (Marmota marmota) parent with young feeding, Hohe Tauern National Park, Austria

Marion Vollborn/ BIA / Leopard (Panthera pardus) cub, Okavango Delta, Botswana

Willi Rolfes/ BIA / Alpine Marmot (Marmota marmota) parent with young feeding, Hohe Tauern National Park, Austria

Juergen Freund / Wildlife carer Margit Cianelli holding Platypus (Ornithorhynchus anatinus) orphan, Atherton Tablelands, Queensland, Australia. Model released.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick next to parent in snow, Atka Bay, Queen Maud Land, Antarctica. October.

John Chan / California least tern chick (Sternula antillarum browni) falling over as it runs towards its parent returning to nest site, Huntington Beach, California, USA, June.

Andy Rouse / African Lion (Panthera leo) cubs age 2 months playing, Masai Mara, Kenya

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged 1-3 weeks on adult's feet, portrait. Atka Bay, Antarctica. August.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chicks aged 20-24 weeks stretching wings, in moult whilst parents fish at sea. Atka Bay, Antarctica. January.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged six to eight weeks sheltering on parent's feet, portrait. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri) chick aged six to eight weeks stretching whilst on brooding parent's feet. Adult looking down at chick. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks brooding on parents' feet. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks brooding on parents' feet, one vocalising. Atka Bay, Antarctica. September.

Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks huddling together. Atka Bay, Antarctica. September.

Nick Upton / Two Red fox (Vulpes vulpes) cubs playing near the entrance to their den at dusk, Somerset, England, UK, May.

Danny Green / Sea otter (Enhydra lutris) resting on sea ice, Alaska, USA, June

Danny Green / Sea otter (Enhydra lutris) resting amongst sea ice, Alaska, USA, June

Danny Green / Sea otters (Enhydra lutris) resting on ice, Alaska, USA, June

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) mother cleaning fawn, Montana

Donald M. Jones / White-tailed Deer (Odocoileus virginianus) doe smelling newborn fawn, Montana

Axel Gomille / Wolf (Canis lupus), cubs playing at edge of woodland, Saxony-Anhalt, Germany, July.

Axel Gomille / Wolf (Canis lupus), cub, Saxony-Anhalt, Germany, July.

Ingo Arndt / Guanaco (Lama guanicoe) cria, Torres del Paine National Park, Patagonia, Chile

Chase Dekker / Red Fox (Vulpes vulpes) kit, Washington

Jack Dykinga / Burrowing owl (Athene cunicularia), two huddled together. Marana, Pima County, Arizona, USA.

Juergen Freund / Wildlife carer wrapping a Spectacled flying fox (Pteropus conspicillatus) baby in blankets, Tolga Bat Hospital, Queensland, Australia.

Valeriy Maleev / Pallas's cat kitten (Otocolobus manul) Sukhe-Batar Aimag, South Gobi Desert, Mongolia. June.

Valeriy Maleev / Long-eared jerboa (Euchoreutes naso) digging, South Gobi Desert, Mongolia. June. Did you know that the Long-eared jerboa is the mammal with the largest ears in proportion to its body size?

Sue Flood / Emperor penguin (Aptenodytes forsteri) walking with young chick at Snow Hill Island rookery, Antarctica. October.

Chien Lee / Minden / White-footed Sportive Lemur (Lepilemur leucopus) in cavity, Madagascar

Suzi Eszterhas / Mallard (Anas platyrhynchos) rehabilitator, Isabel Luevano, with one day old orphan duckling, International Bird Rescue, Fairfield, California

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Michael Quinton / Snowshoe Hare (Lepus americanus) browsing on a Pussy Willow (Salix discolor) twig in winter, Alaska

Ross Hoddinott / Common blue damselfly (Enallagma cyathigerum) portrait, early morning light, Broxwater, Cornwall, UK. June.

David Fleetham / Spinyhead blenny (Acanthemblemaria spinosa) in hard coral, Netherlands Antilles, Bonaire, Caribbean.

Mary McDonald / Mountain gorilla (Gorilla beringei beringei) female with baby age, 4 months, Volcanoes National Park, Rwanda

Juergen & Christine Sohns / African Elephant (Loxodonta africana) calf, Addo National Park, South Africa

Juergen & Christine Sohns / African Elephant (Loxodonta africana) calf drinking at waterhole, Addo National Park, South Africa

Sebastian Kennerknecht / Harbor Seal (Phoca vitulina) pup, Elkhorn Slough, Monterey Bay, California

Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) infant male 'Fifty' aged 3 years portrait.Gombe National Park, Tanzania.

Chien Lee / Lesser Hedgehog Tenrec (Echinops telfairi) in defensive posture, Mangily, Madagascar

Chien Lee / Sugar Glider (Petaurus breviceps) feeding on Acacia (Acacia sp) tree sap at night, Wasur National Park, Papua, Indonesia

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sixteen month old baby female, named Gossamer, in tree, Gombe National Park, Tanzania

Eric Baccega / Giant panda (Ailuropoda melanoleuca) cub playfuly chewing a bamboo stick. Yuan Meng, first giant panda ever born in France, is now 10 months old and still feeds on his mother's milk, Captive at Beauva...

Eric Baccega / Giant panda cub (Ailuropoda melanoleuca) portrait Yuan Meng, first giant panda ever born in France, age 10 months. Captive at Beauval Zoo, Saint Aignan sur Cher, France

Eric Baccega / Giant panda (Ailuropoda melanoleuca) cub playing on wooden structure. Yuan Meng, first giant panda ever born in France, age 10 months, Captive at Beauval Zoo, Saint Aignan sur Cher, France

Lucas Bustamante / Troschel's tree frog / Calcar tree / Convict tree frog (Hypsiboas calcaratus) portrait, on leaf, Cuyabeno, Sucumbios, Ecuador.

Lucas Bustamante / Two Limon glass frogs (Sachatamia ilex) sitting on plant, one above the other, Canande, Esmeraldas.

Jaymi Heimbuch / African Elephant (Loxodonta africana) orphaned calves with keeper, David Sheldrick Wildlife Trust, Nairobi, Kenya

Mark Raycroft / German Shepherd (Canis familiaris) puppies, North America

Mark Raycroft / Golden Retriever (Canis familiaris) puppy, North America

Marion Vollborn/ BIA / African Lion (Panthera leo) cubs drinking at waterhole, Okavango Delta, Botswana

Eric Baccega / Portrait of Giant panda cub (Ailuropoda melanoleuca) captive. Yuan Meng, first Giant panda ever born in France, now aged 8 months, Beauval Zoo, France

Donald M. Jones / Red Squirrel (Tamiasciurus hudsonicus) on pine cone flakes, western Montana

Donald M. Jones / Collared Pika (Ochotona collaris), Denali National Park, Alaska

Michael Hutchinson / Close-up of a European hedgehog (Erinaceus europaeus) sniffing, Bristol, England, UK, 2016.

Luke Massey / Low angle shot of Wild boar (Sus scrofa) piglets running towards parent, Forest of Dean, Gloucestershire, England, UK, May.

Luke Massey / Close-up of a Wild boar (Sus scrofa) piglet feeding, Forest of Dean, Gloucestershire, England, UK, May.

Marion Vollborn/ BIA / Cheetah (Acinonyx jubatus) cub, native to Africa

Alfred Trunk/ BIA / Common Merganser (Mergus merganser) mother carrying chick, Upper Austria, Austria

Nick Saunders/ BIA / Boreal Owl (Aegolius funereus) chicks, Saskatchewan, Canada

Claudio Contreras / Caribbean Flamingo (Phoenicopterus ruber) chick age three days, standing in nest, breeding colony, Ria Lagartos Biosphere Reserve, Yucatan Peninsula, Mexico, June, Finalist in the Portfolio Category o...

Eric Baccega / Caribbean manatee or West Indian manatee (Trichechus manatus) mother with baby, age two days, captive, Beauval Zoo, France

Eric Baccega / Caribbean manatee or West Indian manatee (Trichechus manatus) mother with baby, age two days, captive, Beauval Zoo, France

Vincent Grafhorst / Namib Sand Gecko (Palmatogecko rangei) in desert, Namibia

Vincent Grafhorst / Namib Sand Gecko (Palmatogecko rangei) in desert, Namibia

Ross Hoddinott / Harvest mice (Micromys minutus) on grass stems, Devon, UK. July 2016. Captive.

Ann & Steve Toon / Meerkats (Suricata suricatta) with young, Kgalagadi Transfrontier Park, Northern Cape, South Africa, January.

Edwin Giesbers / Close-up of a litter of Wild boar (Sus scrofa) piglets sleeping on top of their mother, with another piglet joining, Germany, January. Captive.

Edwin Giesbers / Close-up of a litter of Wild boar (Sus scrofa) piglets sleeping on top of their mother, with another piglet joining, Germany, January. Captive.

Edwin Giesbers / Close-up of a litter of Wild boar (Sus scrofa) piglets sleeping on top of their mother, Germany, January. Captive.

Michael Quinton / American Marten (Martes americana) emerging from tree cavity, Alaska

Ingo Arndt / Head portrait of Eastern grey kangaroo {Macropus giganticus} Australia