Napoleon wrasse (cheilinus undulatus) juvenile, an endangered species, Naama Bay, Sharm El Sheikh, Red Sea, Egypt, North Africa, Africa

Hippopotamus (Hippopotamus amphibius) mother and calf, Serengeti National Park, Tanzania, East Africa, Africa

Lion (Panthera leo) cub and its mother, Ngorongoro Crater, Tanzania, East Africa, Africa

Lion (Panthera leo) cub, Ngorongoro Crater, Tanzania, East Africa, Africa

Lion (Panthera leo) cub, Ngorongoro Conservation Area, Tanzania, East Africa, Africa

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

Magnificent frigatebirds (Fregata magnificens), Punta Pitt, San Cristobal Island, Galapagos Islands, Ecuador, South America

Black bear (Ursus americanus) sow and three cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

Swallow-tailed bee-eater (Merops hirundineus) adult and juvenile, Kgalagadi Transfrontier Park, South Africa, Africa

Killer whale calf (Orcinus orca) spy-hopping at sunset near Point Adolphus, Icy Strait, Southeast Alaska, United States of America, North America

California Sea Lion, Zalophus californianus, San Benito Island, Mexico

California Sea Lion, Zalophus californianus, San Benito Island, Mexico

California Sea Lion, Zalophus californianus, San Benito Island, Mexico

Spring lambs, Dorset, England, United Kingdom, Europe

Black bear (Ursus americanus) sow and three cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

White-tailed ptarmigan (Lagopus leucurus) chick, San Juan National Forest, Colorado, United States of America, North America

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, San Benito Island, Mexico

California Sea Lion, Zalophus californianus, San Benito Island, Mexico

Coot (Fulica) young chicks, Gloucestershire, England, United Kingdom, Europe

Young African elephant (Loxodonta africana), Addo Elephant National Park, South Africa, Africa

Juvenile Bicolor Parrotfish, Cetoscarus bicolor, Ambon, Moluccas, Indonesia

Lion (Panthera leo) cub, Ngorongoro Crater, Tanzania, East Africa, Africa

Juvenile Cape Gull in Flight, Larus dominicanus, Indian Ocean, Wild Coast, South Africa

Juvenile magnificent frigatebird (Fregata magnificens) attacking an Elliot's storm petrel (Oceanites gracilis galapagoensis), Punta Pitt, San Cristobal Island, Galapagos Islands, Ecuador, South America

Young mule deer (Odocoileus hemionus) in a snow storm in the Spring, Yellowstone National Park, Wyoming, United States of America, North America

Lion (Panthera leo) cub, Ngorongoro Conservation Area, Tanzania, East Africa, Africa

Snorkellers with a juvenile whale shark (Rhincodon typus) feeding at the suface in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Four lion (Panthera leo) cubs, Ngorongoro Crater, Tanzania, East Africa, Africa

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

California Sea Lion, Zalophus californianus, San Benito Island, Mexico

African elephant (Loxodonta africana) juvenile and adult, Addo Elephant National Park, South Africa, Africa

Three black bear (Ursus americanus) cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

Wild horses, Reykjanes Peninsula, Iceland, Polar Regions

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

Juvenile Mountain Gorilla (Gorilla g. beringei) playing, Virunga Volcanoes, Rwanda, Africa

Juvenile yellow-crowned night heron (Nyctanassa violacea), Genovesa Island, Galapagos Islands, Ecuador, South America

Elk (Cervus canadensis) calf nursing, Yellowstone National Park, Wyoming, United States of America, North America

Three black bear (Ursus americanus) cubs of the year or spring cubs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Juvenile brown pelican (Pelecanus occidentalis) plunge-diving, Gulf of California (Sea of Cortez), Baja California, Mexico, North America

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

Juvenile Great White Pelican, Pelecanus onocrotalus, Walvis Bay, Namibia

Juvenile yellow-crowned night heron (Nyctanassa violacea), Genovesa Island, Galapagos Islands, Ecuador, South America

Juvenile whale shark (Rhincodon typus) with a common remora attached in Honda Bay, Palawan, The Philippines, Southeast Asia, Asia

Pronghorn (Antilocapra americana) bucks sparring, Yellowstone National Park, Wyoming, United States of America, North America

California Sea Lion, Zalophus californianus, Cedros Island, Mexico

Verreaux's Sifaka (Propithecus verreauxi) all white juvenile sitting on forest ground, Berenty Reserve, Southern Madagascar, Africa

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Juvenile Great White Pelican, Pelecanus onocrotalus, Walvis Bay, Namibia

Nazca booby (Sula grantii) chick, Punta Suarez, Santiago Island, Galapagos Islands, Ecuador, South America

Young rabbit, Oryctolagus cuniculas, Isle of May, Firth of Forth, Scotland

California gray whale (Eschrichtius robustus) calf underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale (Eschrichtius robustus) mother and calf underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale (Eschrichtius robustus) mother and calf underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

California gray whale (Eschrichtius robustus) mother and calf underwater in San Ignacio Lagoon, Baja California Sur, Mexico, North America

Juvenile dark chanting goshawk (Melierax metabates), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Young male Bornean orangutan (Pongo pygmaeus), Semenggoh Rehabilitation Center, Sarawak, Borneo, Malaysia, Southeast Asia, Asia

Juvenile Wattled Jacana (Jacana jacana) walking on waterlilies leaves, Manu National Park, Peruvian Amazon, Peru, South America

Saddleback anemonefish embryos develop on the seafloor of Lembeh Strait, Indonesia.

A school of striped eel catfish (Plotosus lineatus) swarms over a reef searching for food in the Lesser Sunda Islands of Indonesia.

A unidentified juvenile lionfish hovers above the seafloor in Lembeh Strait, Indonesia.

A juvenile painted spiny lobster, Panulirus versicolor, crawls out of a reef crevice amid the islands of Raja Ampat, Indonesia.

A juvenile painted spiny lobster, Panulirus versicolor, inhabits a crevice on a reef amid the tropical islands of Raja Ampat, Indonesia.

A small, well-camouflaged cuttlefish, Sepia sp., hovers on a rocky seafloor in the Banda Sea, Indonesia.

A humpback whale and her calf play near the surface.

A larval lionfish floats in the open ocean as plankton, Anilao, Philippines.

Adult yellow-nosed albatross (Thalassarche chlorohynchos) in flight near the Tristan da Cunha Group, South Atlantic Ocean

Juvenile grey heron (Ardea cinerea) in flight, escaping from an aggressive rival in a territorial dispute, Rutland Water, Rutland, England, United Kingdom, Europe

King penguins (Aptenodytes patagonicus) in downy plumage (okum boy) on South Georgia Island, Southern Ocean, Polar Regions

Baby Cape ground squirrel (Xerus inauris), Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Young African elephant (Loxodonta africana), Addo Elephant National Park, South Africa, Africa

Black bear (Ursus americanus) sow and two chocolate cubs of the year or spring cubs, Yellowstone National Park, Wyoming, United States of America, North America

Red fox (Vulpes vulpes) (Vulpes fulva) vixen nursing her kits, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) cow and calf running in the rain, Yellowstone National Park, Wyoming, United States of America, North America

Black bear (Ursus americanus) yearling cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Juvenile double-crested cormorant (Phalacrocorax auritus) spreading its wings to dry, Sonny Bono Salton Sea National Wildlife Refuge, California, United States of America, North America

Mother and calf polar bear (Ursus maritimus) on first year sea ice in Olga Strait, near Edgeoya, Svalbard, Arctic, Norway, Scandinavia, Europe

Juvenile Yellow Crowned Night Heron (Nyctanassa Violacea), wading bird found in the Americas that feeds on crustacea, Bermuda, Atlantic

River Chobe wildlife, elephants, Botswana

Mother and infant Bornean orangutan (Pongo pygmaeus), Semenggoh Rehabilitation Center, Sarawak, Borneo, Malaysia, Southeast Asia, Asia

Two year old young Giant Panda (Ailuropoda melanoleuca) climbing on a tree, Chengdu, Sichuan, China, Asia

Two year old young giant Pandas (Ailuropoda melanoleuca), Chengdu, Sichuan, China, Asia

Two year old young Giant Panda (Ailuropoda melanoleuca), Chengdu, Sichuan, China, Asia

Young brown bear (Ursus arctos) standing looking for salmon, Brooks River, Katmai National Park, Alaska, United States of America

African bush elephant (Loxodonta africana) mother with calf, Liwonde National Park, Malawi, Africa

A juvenile spiny-tailed iguana (Ctenosaura conspicuosa), Isla San Esteban, Baja California, Mexico, North America

Polar bear (Ursus maritimus), cub of the year, playing in the snow in Holmabukta in the Svalbard Archipelago, Norway

Young curious female polar bear (Ursus maritimus), on fast ice near Hinlopen Strait in the Svalbard Archipelago, Norway

Female Orangutan Sumatra with babies (Pongo abelii), Indonesia, Southeast Asia

Mute swans (Cygnus olor) on seashore at freshwater stream mouth, Arran, Scotland, United Kingdom, Europe

Young Antarctic fur seals (Arctocephalus gazella) mock fighting in Grytviken Harbor, South Georgia, Polar Regions

Adult and juvenile king penguins (Aptenodytes patagonicus), at breeding colony at Salisbury Plain, South Georgia, Polar Regions