Marie Read / Common loon (Gavia immer) adult swimming with a chick resting on its back, Presque Isle County, Michigan, USA, June.

Eric Baccega / Close up shot of Female Giant panda (Ailuropoda melanoleuca) Huan Huan, holding her female cub, Beauval ZooPark, France, September 2021.

Richard Hopkins / Female European otter (Lutra lutra) looking directly at camera as her male cub suckles before she turns away from him; he pesters her to feed him again. Shetland, UK, September.

Nick Upton / White stork (Ciconia ciconia) with three chicks in nest at top of an Oak tree, gaping in hot sunshine with one exercising its wings, Knepp Estate, Sussex, UK, June.

Marie Read / Black Skimmer (Rynchops niger) brooding small chick in nest on beach, Long Island, New York, USA, August.

Marie Read / Black Skimmers (Rynchops niger) nesting, one adult feeds a fish to a small chick that emerges from underneath second adult, Long Island, New York USA, August.

John Chan / Double-crested Cormorant (Phalacrocorax auritus) chicks sitting in nest, pestering parent for food before the parent feeds one of the chicks, California, USA, May.

Michael W. Richards / Domestic hen (Gallus gallus domesticus) preening while brooding her chicks in farmyard, when she pecks at ground chicks appear from underneath her, Somerset, UK, September.

Carlos Zorrilla / Common potoo (Nyctibious griseus) sleeping as chick yawns next to it, Ecuador, March.

Rose Summers / Red deer (Cervus elaphus) doe cleaning the face of its young before yawning, Richmond Park, London, England, UK, October.

Simon Littlejohn / Adult female European otter (Lutra lutra) standing with its pup (approximately 14 weeks old) on the edge of the river, the pup raises its front paws onto mum's neck and the female then heads into the...

Simon Littlejohn / Adult female European otter (Lutra lutra) guarding and grooming its pup on riverbank as it eats a fish, River Stour, Dorset, UK, September.

Simon Littlejohn / European otter (Lutra lutra) pup standing on small island of vegetation in the middle of the river, awaiting the return of its mother, the female appears behind the pup who then slips into the water t...

Pal Hermansen / Emperor penguin (Aptenodytes forsteri) chicks huddling beside their parent, one chick calling, Snow Hill Island, Antartica, October.

Simon Littlejohn / Female European otter (Lutra lutra) and two large pups playing and feeding in mid river, River Stour, Dorset, England, UK, June.

Matthew Maran / Red fox vixen (Vulpes vulpes) with two suckling cubs in an allotment, London, England, UK, May.

Matthew Maran / Red fox vixen (Vulpes vulpes) grooming a suckling cub in an allotment, London, England, UK, May.

Matthew Maran / Red fox vixen (Vulpes vulpes) with four suckling cubs in an allotment, one jumping over her back, London, England, UK, May.

Matthew Maran / Red fox vixen (Vulpes vulpes) with four suckling cubs in an allotment, cubs start to play, London, England, UK, May.

Matthew Maran / Close up of a Red fox vixen (Vulpes vulpes) grooming her five cubs at den entrance in an allotment, cubs begin to suckle, London, England, UK, April.

Matthew Maran / Red fox vixen (Vulpes vulpes) grooming and playing with her cubs in an allotment, London, England, UK, June.

Matthew Maran / Red fox vixen (Vulpes vulpes) feeding her cubs at entrance to den in an allotment, London, England, UK, April.

Matthew Maran / Red fox vixen (Vulpes vulpes) feeding her cubs at entrance to den in an allotment, London, England, UK, April.

John Cancalosi / Timber rattlesnakes (Crotalus horridus) at nest site with young, Pennsylvania, USA.

Morley Read / Slow motion clip of a Mute swan (Cygnus olor) with three cygnets, Cornwall, England, UK, May.

Ingo Arndt / Female Puma (Puma concolor) with two cubs aged around four months, Torres del Paine National Park, Patagonia, Chile, July.

John Chan / Great horned owl (Bubo virginianus) chick watching for parents to return with food, Southern California, USA, June.

Espen Bergersen / Aerial shot of a female Humpback whale (Megaptera novaeangliae) and calf surrounded by Killer whales (Orcinus orca), mother hits sideways with her tail fluke to drive Killer whales away, Skjervoy, Tro...

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.

Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.

Brian Bevan / Juvenile Green woodpecker (Picus viridis) leaving nest hole, shot looking up trunk, Bedfordshire, England, UK, June.

Brian Bevan / Male Green woodpecker (Picus viridis) feeding young at nest hole, shot looking up trunk, Bedfordshire, England, UK, June.