Danny Green / Polar bear (Ursus maritimus), two cubs playing, leaping across sea ice, reflected in water. Svalbard, Norway, July.

Danny Green / Polar bear (Ursus maritimus), two cubs walking on sea ice. Svalbard, Norway, July.

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

Jack Dykinga / Burrowing owl (Athene cunicularia) female and ten chicks aged a few weeks. Marana, Arizona, USA. May.

Matthew Maran / Red fox (Vulpes vulpes) cub defending its kill,a large Brown rat (Rattus norvegicus) from another cub, North London, UK. August. Highly commended in the Behaviour : Mammals Category of the Wildlife Ph...

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

Bence Mate / African wild dogs (Lycaon pictus) juveniles playing with the leg of an impala, trying to drag it in three different directions. Mkuze, South Africa. Commended in Glanzlichter photo competition 2020.

Paul Hobson / Red fox (Vulpes vulpes), two cubs play fighting. Sheffield, England, UK. May.

Paul Williams / Moose (Alces alces) female with twin calves, Baxter State Park, Maine, USA, June.

Michael Quinton / Northern Hawk Owl (Surnia ulula) parent with chicks at nest, Alaska

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, playing with her three year old brother, named Fifty, Gombe National Park, Tanzania

Dave Bevan / Welsh mountain sheep cleaning afterbirth from a lamb before a second lamb is born, Carmarthenshire, Wales, UK, March.

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

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

Nick Upton / Two Eurasian beaver kits (Castor fiber) feeding at night, born in the wild on the River Otter as part of the River Otter Beaver Trial, Devon, England, UK, August 2015.

Danny Green / Black bears (Ursus americanus) three cubs, one climbing, Minnesota, USA, June

Suzi Eszterhas / Crowned lemur (Eulemur coronatus) mother with twin infants, East Coast of Madagascar.

Jane Burton / British Shorthair kittens, Benedict, ginger, and Joan, silver tabby.

Mark Taylor / Tabby cats, Picasso and Smudge, age 3 months, together. Smudge with his paws up on Picasso.

Edwin Giesbers / Western lowland gorilla (Gorilla gorilla gorilla) twin babies age 45 days resting on mother's chest, one suckling. captive, occurs in Central Africa. Critically endangered.

Edwin Giesbers / Western lowland gorilla (Gorilla gorilla gorilla) twin babies age 45 days sleeping in mother's arms, captive, occurs in Central Africa. Critically endangered.

Edwin Giesbers / Western lowland gorilla (Gorilla gorilla gorilla) twin babies age 45 days sleeping on mother's chest, captive, occurs in Central Africa. Critically endangered.

Edwin Giesbers / Western lowland gorilla (Gorilla gorilla gorilla) twin babies age 45 days resting side by side in mother's arms, captive, occurs in Central Africa. Critically endangered.

Edwin Giesbers / Western lowland gorilla (Gorilla gorilla gorilla) twin babies age 45 days, resting on mother's chest, captive, occurs in Central Africa. Critically endangered.

Pedro Narra / Green turtle (Chelonia mydas) hatchlings emerging from nest, Bissagos Islands, Guinea Bissau. Endangered species. 3rd Place in the SOS Especes Menacees / SOS Endangered Species Portfolio category of...

Fabrice Cahez / Red fox (Vulpes vulpes) cubs playing, Vosges, France, May.

Fabrice Cahez / Red fox (Vulpes vulpes) cubs playing, Vosges, France, May.

Pete Oxford / Kittens resting on beams. These animals are kepts as pets but sometimes eaten in the Apatani Tribe, Ziro Valley, Himalayan Foothills, Arunachal Pradesh, North East India. November 2014.

Will Burrard-Lucas / Three Ethiopian wolf (Canis simensis) pups waiting for their parents to return, Ethiopia.

Yukihiro Fukuda / Japanese macaque (Macaca fuscata fuscata) rare white furred baby playing with another baby. Jigokudani Valley, Nagano Prefecture, Japan. June.

Bruno D'Amicis / Fennec fox (Vulpes zerda) pups playing outside of den, Grand Erg Oriental, Kebili Governorate. Tunisia.

George Sanker / White-tailed deer (Odocoileus virginianus) mother with fawn. Acadia National Park, Maine, USA, September.

Espen Bergersen / Atlantic puffin (Fratercula arctica) two fighting in snow, Hornoya bird cliff, Finnmark, Norway. March.

Cyril Ruoso / Bonobo (Pan paniscus) orphan babies, Lola Ya Bonobo Sanctuary, Democratic Republic of the Congo. Non-ex

David Kjaer / Great bustard (Otis tarda) chicks hatched from eggs collected under licence from the Castilla-La Mancha region of Spain.

Erlend Haarberg / Arctic fox (Alopex lagopus) cubs looking curiously, Dovrefjell-Sunndalsfjella National Park, Norway, July.

Erlend Haarberg / Arctic fox (Alopex lagopus) cubs playing, Dovrefjell-Sunndalsfjella National Park, Norway, July.

Erlend Haarberg / Arctic fox (Alopex lagopus) cubs looking curiously, Dovrefjell-Sunndalsfjella National Park, Norway, July.

Michael Quinton / Northern Flicker (Colaptes auratus) chicks in nest cavity ready to fledge, Alaska

Michael Quinton / Northern Flicker (Colaptes auratus) chicks in nest cavity ready to fledge, Alaska

Michael Quinton / Northern Flicker (Colaptes auratus) chicks in nest cavity ready to fledge, Alaska

Tui De Roy / Emperor penguin (Aptenodytes forsteri) chicks, Amanda Bay, Prydz Bay, Ingrid Christensen Coast, East Antarctica, November.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month cubs play fighting, Ranthambhore National Park, India.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month cubs play fighting, Ranthambhore National Park, India.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month old cubs play fighting, Ranthambhore National Park, India.

Andy Rouse / Bengal tiger (Panthera tigris tigris) 11 month cubs play fighting, Ranthambhore National Park, India.

Marie Read / Canada goose (Branta canadensis) adult swimming leading five goslings, Ithaca, New York, USA.

Andy Trowbridge / Two Yellow-eyed penguin (Megadyptes antipodes) chicks standing together. Otago Peninsula, Otago, South Island, New Zealand, January. Endangered Species.

David Pattyn / Great crested grebe (Podiceps cristatus) close-up of an adult with two young chicks. The Netherlands. June 2014

Fiona Rogers / Tana mangabey (Cercocebus galeritus) babies sitting together - portrait. Tana River Forest, South eastern Kenya.

Michel Poinsignon / Two tawny owl (Strix aluco) chicks emerging from nest in tree, Luxembourg. May.

Mark Raycroft / Pembroke Welsh Corgi (Canis familiaris) puppies

Matthias Breiter / Polar Bear (Ursus maritimus) mother and three-month-old cubs, Wapusk National Park, Manitoba, Canada

Charlie Summers / Two juvenile Brown Bear siblings (Ursus arctos) look for food on the banks of the Anan Creek lagoon, Alaska, July.

Kevin Schafer / Gentoo Penguin (Pygoscelis papua) parent with chicks, Pleneau Island, Antarctic Peninsula, Antarctica

Tom Gilks / Tanzanian boys doing homework using oil lamp, Tanzania.

Sergey Gorshkov / Arctic Fox (Alopex lagopus) pups playing, Wrangel Island, Russia

Cyril Ruoso / Barbary Macaque (Macaca sylvanus) mother with infant reprimanding her older child, Morocco

David Tipling / Young brother and sister bird watching in woodland in summer, Norfolk. July 2012. Model Released Model released.

Andy Rouse / 2020VISION / Barn Owl (Tyto alba) perched on old plough. Wales, December. Did you know? Baby barn owls can recognise their sibling's calls.

Juergen Freund / Spectacled flying fox (Pteropus conspicillatus) babies swaddled in cloth ready to sleep, Tolga Bat Hospital, Atherton, North Queensland, Australia. January 2008.

Donald M. Jones / Coyote (Canis latrans) six week old pups, western Montana

Mark Taylor / RF- Two Miniature Goldendoodle puppies (Golden retriever x Miniature Poodle cross), 7 weeks, one lying across the other. (This image may be licensed either as rights managed or royalty free.)

Kevin Schafer / Mountain Lion (Puma concolor) cubs playing in snow, Utah

Jasper Doest / Arctic Fox (Alopex lagopus) kits playing, Svalbard, Norway

Winfried Wisniewski / Cheetah (Acinonyx jubatus) mother with five cubs on a termite mound, Masai Mara National Reserve, Kenya

Graham Eaton / Female Barn swallow (Hirundo rustica) passing food to a sibling in flight, UK

Suzi Eszterhas / Black Bear (Ursus americanus) 7 week old cubs playing in den. One cub shows brown color phase while the other shows black color phase

Suzi Eszterhas / Cheetah (Acinonyx jubatus) mother and eight week old cubs, Maasai Mara Reserve, Kenya

Tim Fitzharris / Red Fox (Vulpes vulpes) trio of kits peeking out of their den, North America

Mitsuaki Iwago / Cheetah (Acinonyx jubatus) two cubs in tree, Serengeti, Tanzania

Ingo Arndt / European River Otter (Lutra lutra) sisters resting, Europe

Ingo Arndt / European River Otter (Lutra lutra) sisters resting, Europe

Suzi Eszterhas / African Lion (Panthera leo) four to five week old cubs, vulnerable, Masai Mara National Reserve, Kenya

Mark Raycroft / Beagle (Canis familiaris) puppy pair on red blanket

Mark Raycroft / Australian Cattle Dog (Canis familiaris) puppies

Mark Raycroft / Australian Cattle Dog (Canis familiaris) group of puppies

Mark Raycroft / Rhodesian Ridgeback (Canis familiaris) puppy pair sitting amid apples

Mark Raycroft / Australian Shepherd (Canis familiaris) two puppies sitting in grass

ZSSD / African Lion (Panthera leo) two cubs playing together, native to Africa

Mark Raycroft / Golden Retriever (Canis familiaris) puppies together with front paws up on a log

Flip de Nooyer / Eurasian Kestrel (Falco tinnunculus) group of five juveniles in nesting box, Europe

Flip de Nooyer / Gentoo Penguin (Pygoscelis papua) two downy chicks standing together in nesting colony, Antarctica

Duncan Usher / Wild Boar (Sus scrofa) three piglets playing, Europe

Tim Fitzharris / African Lion (Panthera leo) three cubs resting on a rock, Hwange National Park, Zimbabwe

Mitsuaki Iwago / African Lion (Panthera leo) cubs in crook of tree, Serengeti National Park, Tanzania

Mitsuaki Iwago / African Lion (Panthera leo) cubs playing, Serengeti National Park, Tanzania

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) adult female nursing her two yearling cubs on sedge flats, Katmai National Park, Alaska

Michael Quinton / Red Squirrel (Tamiasciurus hudsonicus) four young at entrance to their nest in a tree cavity, Alaska

Flip de Nooyer / Mute Swan (Cygnus olor) three cygnets on parent's back, Europe

Matthias Breiter / Grizzly Bear (Ursus arctos horribilis) cubs silhouetted against water at sunrise, Katmai National Park, Alaska

Yva Momatiuk & John Eastcott / Grizzly Bear (Ursus arctos horribilis) pair of spring cubs, Denali National Park and Preserve, Alaska

Konrad Wothe / Timber Wolf (Canis lupus) mother with two pups begging for food at den entrance, Pine County, Minnesota

Konrad Wothe / Canada Lynx (Lynx canadensis) kitten pair peering out from hollow log, North America

Konrad Wothe / Barn Swallow (Hirundo rustica) chicks lined up in nest with their mouths open waiting for food, Germany

Yva Momatiuk & John Eastcott / Mustang (Equus caballus) palomino yearling filly and her spring foal brother grooming each other, Pryor Mountain Wild Horse Range, Montana