Ingo Arndt / Japanese Macaque (Macaca fuscata) adult with young, Japan

Tui De Roy / Galapagos Sea Lion (Zalophus wollebaeki) mother and pup sleeping together, Punta Espinosa, Fernandina Island, Galapagos Islands, Ecuador

Flip Nicklin / Bowhead Whale (Balaena mysticetus) pair nuzzling each other, Isabella Bay, Baffin Island, Nunavut Territory, Canada

Tui De Roy / Celebes Black Macaque (Macaca nigra) grooming session which cements troop bond, Tangkoko-Dua Saudara Nature Reserve, Sulawesi, Indonesia

Mitsuaki Iwago / Pyrenean Mountain Dog (Canis familiaris) mother playing with pup, Japan

Jim Brandenburg / Arctic Wolf (Canis lupus) pups nuzzling one another, Ellesmere Island, Nunavut, Canada

ZSSD / Western Lowland Gorilla (Gorilla gorilla gorilla) mother holding her baby, native to Africa

ZSSD / Giant Panda (Ailuropoda melanoleuca) mother Bai Yun cuddling with her two year old cub Hua Mei on their last day together before being separated to complete the weaning process, native to Asia

Flip Nicklin / Bearded Seal (Erignathus barbatus) researcher comforting captured pup, Norway

Mitsuaki Iwago / Domestic Cat (Felis catus) mother and infant kitten resting together

Mitsuaki Iwago / Domestic Cat (Felis catus) two adult Tabby cats resting together and grooming each other

Mitsuaki Iwago / Domestic Cat (Felis catus) two adult Tabby cats resting together and grooming each other

Suzi Eszterhas / Mountain Gorilla (Gorilla gorilla beringei) silverback gently sliding one and a half year old baby off his back, Parc National des Volcans, Rwanda

Tui De Roy / Emperor Penguin (Aptenodytes forsteri) nuzzling chick, Prydz Bay, eastern Antarctica

Mitsuaki Iwago / Japanese Macaque (Macaca fuscata) mother and young, Jigokudani, Japan

Konrad Wothe / Emperor Penguin (Aptenodytes forsteri) adult with chick, Antarctica

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

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

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

Gerry Ellis / African Elephant (Loxodonta africana) keeper Benson playing with baby orphan Nyiro, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Thomas Mangelsen / Mountain Lion (Puma concolor) mother and sleeping cub at den entrance, Miller Butte, National Elk Refuge, Wyoming

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) Xi Xi with her 32 day old cub, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) Xi Xi with her 32 day old cub, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Gerry Ellis / African Elephant (Loxodonta africana) orphan babies in bush tended to by Mishak Nzimbi, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Gerry Ellis / African Elephant (Loxodonta africana) keeper Mishak Nzimbi tending to baby orphans, David Sheldrick Wildlife Trust, Tsavo East National Park, Kenya

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) Xi Xi with her 32 day old cub, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Katherine Feng / Giant Panda (Ailuropoda melanoleuca) Gongzhu nursing her one day old cub, holding him in place with her chin, China Conservation and Research Center for the Giant Panda, Wolong Nature Reserve, China

Konrad Wothe / Emperor Penguin (Aptenodytes forsteri) parents with chicks, Antarctica