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Galapagos Marine Iguana (Amblyrhynchus cristatus) Santa Cruz island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos Land Iguana (conolophus subcristatus), a large lizard species, that can grow up to five feet long and live 60 years, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Chimpanzee (Pan troglodytes), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Chimpanzee (Pan troglodytes), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Chimpanzee (Pan troglodytes), Gombe Stream National Park, Lake Tanganyika, Tanzania, East Africa, Africa

Adult San Esteban spiny-tailed iguana (Ctenosaura conspicuosa), endemic to Isla San Esteban, Baja California, Mexico, North America

Galapagos Land Iguana (Conolophus subcristatus), large lizard can can grow to five feet long and live for 60 years, South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Galapagos Land Iguana (Conolophus subcristatus), can grow to five feet long and live for 60 years, South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult rockhopper penguins (Eudyptes chrysocome chrysocome) at breeding and molting colony on New Island, Falkland Islands

Southern Right Whale (Eubalaena australis) adult surfacing near Puerto Pyramides, Peninsula Valdez, Argentina

Southern Right Whale (Eubalaena australis) mother and calf being harassed by kelp gull, Peninsula Valdez, Argentina

Magellanic penguins (Spheniscus magellanicus) at a breeding and molting site in Estancia San Lorenzo, Argentina

Osprey (Pandion haliaetus), in flight to its nest, Isla San Lorenzo, Baja California, Sea of Cortez, Mexico, North America

Spectral Tarsier (Tarsius tarsier) one of the smallest primates, now endangered, insect eating and nocturnal, Tangkoko National Park, Minahasa Highlands, North Sulawesi, Indonesia, Southeast Asia, Asia

Galapagos Giant Tortoise (Chelonoidis chathamensis), can live for over 100 years, San Cristobal island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Galapagos Giant Tortoise (Geochelone chatamensis), can live to 100 years, on San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

A long-beaked common dolphin (Delphinus capensis), surfacing off Gorda Banks, Baja California Sur, Mexico, North America

Spectral Tarsier (Tarsius tarsier) one of the smallest primates, now endangered, insect eating and nocturnal, Tangkoko National Park, Minahasa Highlands, North Sulawesi, Indonesia, Southeast Asia, Asia

Spectral Tarsier (Tarsius tarsier) one of the smallest primates, now endangered, insect eating and nocturnal, Tangkoko National Park, Minahasa Highlands, North Sulawesi, Indonesia, Southeast Asia, Asia

Spectral Tarsier (Tarsius tarsier) one of the smallest primates, now endangered, insect eating and nocturnal, Tangkoko National Park, Minahasa Highlands, North Sulawesi, Indonesia, Southeast Asia, Asia

A Cape wild dog (Lycaon pictus pictus), listed as Endangered, South Luangwa National Park, Zambia, Africa

An adult female green sea turtle (Chelonia mydas), coming ashore to nest on Isla Espiritu Santo, Sea of Cortez, Mexico, North America

Black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis) pair, Ngorongoro Crater, Tanzania, East Africa, Africa

A Cape wild dog (Lycaon pictus pictus), listed as Endangered, South Luangwa National Park, Zambia, Africa

Black rhinoceros (hook-lipped rhinoceros) (Diceros bicornis) pair, Ngorongoro Crater, Tanzania, East Africa, Africa

Wild elephants in Hurulu Eco Park biosphere reserve, Habarana, Anuradhapura District, Sri Lanka, Asia

A Forester kangaroo at Stumpys Bay, a previously endangered species, now common here in Mt. William National Park, north east, Tasmania, Australia, Pacific

Amur tiger. Panthera tigris altaica. Portrait of one year old tiger (called cotto) in snow. Zurich zoo, zurich, switzerland

White rhinoceros (ceratotherium simum) eating grass, close-up of head showing horns, eastern cape, south africa

Humpback whale, megaptera novaeangliae. back and blowhole at sunset; mountains as backdrop; evening light

White rhinoceros (ceratotherium simum) eating grass, close-up of head showing horns, eastern cape, south africa

A Forester kangaroo at Stumpys Bay, a previously endangered species, now common here in Mt. William National Park, north east, Tasmania, Australia, Pacific

Amur tiger. Panthera altaica. Captive. Portrait of one year old tigern (called cotto) in snow,winter. Zoo zurich, zurich, switzerland

Endangered Amazon manatees (Trichechus inunguis) waiting for fresh water in a holding tank, Manaus, Amazonas, Brazil, South America

Endangered Amazon manatees (Trichechus inunguis) waiting for fresh water in a holding tank, Manaus, Amazonas, Brazil, South America

Adult male green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay on the northwest side of the island of Maui, Hawaii, USA

Mother polar bear (Ursus maritimus) with two coy (cubs-of-year) on multi-year ice floes in the Barents Sea off the eastern side of Heleysundet in the Svalbard Archipelago, Norway

Hawaiian Spinner Dolphin (Stenella longirostris) spinning, possibly to dislodge attached remoras, Lanai, Hawaii, USA, Pacific Ocean

Black-browed albatross (Thalassarche melanophrys) breeding colony on Steeple Jason Island in the Falkland Islands, South Atlantic Ocean

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA

A curious adult polar bear (Ursus maritimus) approaches the National Geographic Explorer in the Barents Sea, Edge Island, Svalbard Archipelago, Norway

Adult green sea turtle (Chelonia mydas) in the protected marine sanctuary at Honolua Bay, Maui, Hawaii, USA