Stefan Christmann / Emperor penguin (Aptenodytes forsteri) pair in courtship, on sea ice. Atka Bay, Antarctica. May.

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

Cyril Ruoso / Golden monkey (Rhinopithecus roxellana) adult male and female hugging, Qinling Mountains, China.

Anup Shah / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) females hugging to reinforce rank. Jodhpur, Rajasthan, India. March.

Fiona Rogers / Southern plains grey langur / Hanuman langur (Semnopithecus dussumieri) infant aged a few weeks. Jodhpur, Rajasthan, India. March.

Edwin Giesbers / Brown headed spider monkey (Ateles fusciceps) mother and baby, captive occurs in Central and South America.

Edwin Giesbers / Brown headed spider monkey (Ateles fusciceps) group resting together, captive occurs in Central and South America.

Klein & Hubert / Tabby and white mother and kitten (age 7 weeks) in garden. France.

Anup Shah / Eastern chimpanzee (Pan troglodytes schweinfurtheii) young baby of adolescent female 'Golden' suckling. Gombe National Park, Tanzania.

Pascal Pittorino / Mediterranean tree frogs (Hyla meridionalis) mating on a branch of Quince tree (Cydonia oblonga) Var, Provence, France, April.

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

Aflo / Japanese macaque (Macaca fuscata) mother cuddling baby, Yamanouchi, Shimotakai District, Nagano Prefecture, Japan. June.

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother with joey aged eight months, Queensland, Australia, captive.

Will Burrard-Lucas / Meerkat (Suricata suricatta) adult with babies, Makgadikgadi Pans, Botswana.

Diane McAllister,Diane McAllister / Japanese Macaque (Macaca fuscata) male and female huddle together during a light snowfall in Jigokudani Japan, January

Anup Shah / Olive baboon (Papio cynocephalus anubis) juvenile cuddling an infant aged 9-12 months, Masai Mara National Reserve, Kenya, August

Anup Shah / Bornean Orangutan (Pongo pygmaeus wurmbii) female 'Unyuk' cuddling her daughter 'Ursula', age 4 years. Camp Leakey, Tanjung Puting National Park, Central Kalimantan, Borneo, Indonesia. June 2010. Reha...

Florian Möllers / Quinling Golden snub nosed Monkey (Rhinopitecus roxellana qinlingensis), infant suckling Zhouzhi Nature Reserve, Qinling Mountains, Shaanxi, China.

Mark Hamblin / 2020VISION / Close up of hands of woman 'hugging' Scots pine tree (Pinus sylvestris), Abernethy Forest, Cairngorms National Park, Scotland, UK, August 2010, Model released. 2020VISION Book Plate. Did you know? The...

Kim Taylor / Brown bear {Ursus arctos} hugging a pine tree. Finland.

Anup Shah / Olive baboon babes hugging one another {Papio anubis} Kenya, East Africa

Ingo Arndt / African Lion (Panthera leo) juveniles play fighting, Masai Mara National Reserve, Kenya

Suzi Eszterhas / Koala (Phascolarctos cinereus) mother and joey, Kangaroo Island, Australia

Sebastian Kennerknecht / Sea Otter (Enhydra lutris) pup hugging mother, Elkhorn Slough, Monterey Bay, California

Richard Du Toit / African Lion (Panthera leo) mother and cub, Kgalagadi Transfrontier Park, South Africa

Cyril Ruoso / Bonobo (Pan paniscus) female with newborn, Sanctuary Lola Ya Bonobo Chimpanzee, Democratic Republic of the Congo

Cyril Ruoso / Bonobo (Pan paniscus) pair of orphans hugging, Sanctuary Lola ya Bonobo, Democratic Republic of the Congo

Matthias Breiter / Polar Bear (Ursus maritimus) female with twelve week old cub, Canada

Thomas Marent / Japanese Macaque (Macaca fuscata) mother holding baby for warmth, Jigokudani, Nagano, Japan

Fiona Rogers / Japanese Macaque (Macaca fuscata) female holding her baby, Jigokudani Monkey Park, Japan

Fiona Rogers / Japanese Macaque (Macaca fuscata) female cuddling her baby, Jigokudani Monkey Park, Japan

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) mother holding five month old twin babies, Parc National des Volcans, Rwanda

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) mother holding five month old twin babies, Parc National des Volcans, Rwanda

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) female and pup nuzzling, Galapagos Islands, Ecuador

Suzi Eszterhas / Sea Otter (Enhydra lutris) mother holding one week old pup, Monterey Bay, California

Stephen Belcher / Japanese Macaque (Macaca fuscata) young embracing at edge of hot spring, Jigokudani, Joshinetsu Kogen National Park, Japan

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

Gerry Ellis / Koala (Phascolarctos cinereus) mother with joey, eastern temperate Australia

Gerry Ellis / Orangutan (Pongo pygmaeus) mother and baby, Borneo

Konrad Wothe / Black-tailed Prairie Dog (Cynomys ludovicianus) pair interacting, North America

Thomas Mangelsen / Polar Bear (Ursus maritimus) pair wrestling, Churchill, Manitoba, Canada

Tim Fitzharris / Raccoon (Procyon Lotor) two babies climbing tree, North America

Tim Fitzharris / Raccoon (Procyon Lotor) two babies climbing tree, North America

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) pair with chick, Atka Bay, Princess Martha Coast, Weddell Sea, Antarctica

Mitsuaki Iwago / Western Grey Kangaroo (Macropus fuliginosus) group with one scratching companion, Kangaroo Island, Australia

Mitsuaki Iwago / Red Kangaroo (Macropus rufus) mother embracing joey, Sturt National Park, New South Wales, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) group sitting on branch, Lone Pine Koala Sanctuary, Brisbane, Australia

Shin Yoshino / Koala (Phascolarctos cinereus) mothers and babies in tree, Australia