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

Cheetah (Acinonyx jubatus) yawning, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

The Philippine tarsier (Tarsius syrichta), known locally as the Maumag, an endangered tarsier species endemic to the Philippines, Southeast Asia, Asia

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

Green sea turtle (Chelonia mydas) underwater with snorkeler, Maui, Hawaii, United States of America, Pacific

The critically endangered hawksbill turtle (Eretmochelys imbricata) above coral reef, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

The critically endangered hawksbill turtle (Eretmochelys imbricata), Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

A curious young polar bear (Ursus maritimus) on the ice in Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

A curious young polar bear (Ursus maritimus) on the ice in Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

A curious young polar bear (Ursus maritimus) on the ice in Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

A curious young polar bear (Ursus maritimus) on the ice in Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

A curious young polar bear (Ursus maritimus) on the ice in Bear Sound, Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

Polar bear (Ursus maritimus), Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Polar bear (Ursus maritimus) and cub, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Toque macaque monkey, named for its hair, endangered, Royal Botanic Gardens, Peradeniya, Kandy, Sri Lanka, Asia

Toque macaque monkey, named for its hair, endangered, Royal Botanic Gardens, Peradeniya, Kandy, Sri Lanka, Asia

Verreaux's sifaka (Propithecus verreauxi) on a tree, Berenty Nature Reserve, Fort Dauphin, Toliara Province, Madagascar, Africa

A red panda remains hidden in his shelter, built by forest guards who protect this endangered animal, Darjeeling, India, Asia

A lesser panda (red panda) in a wildlife reserve in India where tourists can observe this endangered animal, Darjeeling, India, Asia

A red panda goes down from a tree in a wildlife reserve of India where these animals are protected from poachers, Darjeeling, India, Asia

Howling Indri lemur (Indri indri), Analamazaotra Special Reserve, Andasibe, central area, Madagascar, Africa

Polar bear cub (Ursus maritimus) jumping over the water, Spitsbergen Island, Svalbard archipelago, Arctic, Norway, Scandinavia, Europe

Aldabra giant Seychelles tortoise (Aldabrachelys gigantea), Anse Takamaka, Mahe, Republic of Seychelles, Indian Ocean, Africa

Group of spotted eagle rays (Aetobatis narinari), Oahu, Hawaii, United States of America, Pacific, North America

Green sea turtles (Chelonia mydas), gather at a cleaning station off West Maui, Hawaii, United States of America, Pacific, North America

Adult polar bear (Ursus maritimus) on the ice near Moffen Island, Svalbard, Norway, Scandinavia, Europe

Giant Aldabra Seychelles tortoise (Aldabrachelys gigantea), Union Estate Park, La Digue, Republic of Seychelles, Indian Ocean, Africa

A sperm whale (Physeter macrocephalus), slapping the water with its tail fluke, Sri Lanka, Indian Ocean, Asia

A female green sea turtle (Chelonia mydas), and schooling bigeye jacks (Caranx sexfasciatus), Malaysia, Southeast Asia, Asia

A hawksbill sea turtle (Eretmochelys imbricata), in a colorful overhang on a reef in the Koro Sea, Fiji, South Pacific, Pacific

Florida manatees (Trichechus manatus latirostris), gather at Three Sisters Springs in Crystal River, Florida, United States of America, North America

Green sea turtles (Chelonia mydas), an endangered species, Hawaii, United States of America, Pacific, North America

A green sea turtle (Chelonia mydas) makes its way to the surface off Maui, Hawaii, United States of America, Pacific, North America

Adult polar bear (Ursus maritimus) on the ice in Gashamna (Goose Bay), Spitsbergen Island, Svalbard, Norway, Scandinavia, Europe

Verreaux's sifaka (Propithecus verreauxi) jumping, Berenty Nature Reserve, Fort Dauphin, Toliara Province, Madagascar, Africa

White rhino (Ceratotherium simum) bulls in confrontation, Zimanga private game reserve, KwaZulu-Natal, South Africa, Africa

Golden-crowned Sifaka (Propithecus tattersalli), an endangered species, sunbathing on ground, Daraina, Northern Madagascar, Africa

A hawksbill turtle (Eretmochelys imbricata), swims over a reef in the Pacific Ocean, Philippines, Southeast Asia, Asia

Green sea turtle getting its shell cleaned by goldring surgeonfish off Maui, Hawaii, United States of America, Pacific, North America

Several green sea turtles (Chelonia mydas) gather at a cleaning station off West Maui, Hawaii, United States of America, Pacific, North America

Giant Aldabra Seychelles tortoise (Aldabrachelys gigantea), Union Estate Park, La Digue, Republic of Seychelles, Indian Ocean, Africa

Endangered Florida manatee (Trichechus manatus latirostris), at Three Sisters Spring in Crystal River, Florida, United States of America, North America