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El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

First year Adelie penguin (Pygoscelis adeliae) chick at breeding colony at Brown Bluff, Antarctica, Polar Regions

Dead Adelie penguin (Pygoscelis adeliae) attacked and killed, but not eaten, by an Antarctic fur seal at Brown Bluff, Antarctica, Polar Regions

Adult chinstrap penguin (Pygoscelis antarctica) feeding chick at Baily Head on Deception Island, Antarctica, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) breeding and molting at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) molting at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) breeding and molting at Half Moon Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) chick chasing adult for food at Hannah Point on Livingston Island, Antarctica, Polar Regions

Chinstrap penguin (Pygoscelis antarctica) breeding colony at Baily Head on Deception Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) adult with chick on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) breeding colony on Booth Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) adult with chicks at breeding colony on Booth Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) chicks covered with mud and guano on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) adult with chicks on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Gentoo penguin (Pygoscelis papua) adults molting on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Expedition ship Polar Star operating from Ushuaia, Argentina to the Antarctic Peninsula in Antarctica, Southern Ocean, Polar Regions

South American sea lions (Otaria flavescens) hauled out on small rocky islet just outside Ushuaia, Argentina, South America

Adult great egret (Ardea alba egretta) feeding at low tide in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Architectural detail of the Acropolis Museum, an archaeological museum located in the historic center of Athens, Greece, Europe

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos fur seal (Arctocephalus galapagoensis) hauled out on lava flow in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

African elephant (Loxodonta africana) and giraffes (Giraffa camelopardalis) at sunset, Nxai Pan National Park, Botswana, Africa

Two African elephants (Loxodonta africana) drinking at a waterhole with two elephant carcasses that have died due to drought, Savuti, Chobe National Park, Botswana, Africa

White-backed vultures (Gyps africanus) and Marabou Stork (Leptoptilos crumeniferus) feed on an African elephant (Loxodonta africana), Savuti, Chobe National Park, Botswana, Africa

Opuntia (Prickly Pear) cacti on South Plaza island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Coastline and recovery place of the Chinchorro Mummies, UNESCO World Heritage Site, Camarones Valley, northern Atacama desert, Chile, South America

El Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Atlantic, Europe

Ramses IV tomb, Valley of the Kings, UNESCO World Heritage Site, Thebes, Luxor, Egypt, North Africa, Africa

The Billings Gap Overlook on the east side of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Close up of Engelmann's prickly-pear (Opuntia engelmannii) cactus in bloom, Watchman trail, Zion National Park, Utah, United States of America, North America

California gray whale calf (Eschrictius robustus), surfacing in San Ignacio Lagoon, Baja California, Mexico, North America

Young Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Swallow-tailed gull (Creagrus furcatus) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult swallow-tailed gull (Creagrus furcatus) on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult green sea turtles (Chelonia mydas agassizii) underwater off the west side of Isabela, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult waved albatrosses (Diomedea irrorata) at breeding colony on Espanola Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Surf breaking on lava shoreline at Gardner Bay on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Captive Galapagos giant tortoise (Geochelone elephantopus) at the Charles Darwin Research Station, Galapagos, UNESCO World Heritage Site, Ecuador, South America

The endemic lava cactus (Brachycereus spp) cactus growing in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Wild Galapagos giant tortoise (Geochelone elephantopus) feeding on the upslope grasslands of Santa Cruz Island, 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

Bartolome Island with Pinnacle Rock, a volcanic plug, to the right, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Wild Galapagos giant tortoise (Geochelone elephantopus) feeding on the upslope grasslands of Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

American oystercatcher (Haematopus palliatus galapagensis) chick along the shoreline on Bartolome Island in the Galapagos Island Group, UNESCO World Heritage Site, Ecuador, South America

Adult American oystercatcher (Haematopus palliatus galapagensis) feeding chick along the shoreline on Bartolome Island in the Galapagos Island Group, UNESCO World Heritage Site, Ecuador, South America

Lava lizard (Microlophus spp) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Lava lizard (Microlophus spp) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Guests from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A small pod of killer whales (Orcinus orca) off the west coast of Isabela Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Guest from the Lindblad Expedition ship National Geographic Endeavour in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Sally lightfoot crab (Grapsus grapsus) in the littoral of the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult red-billed tropicbird (Phaethon aethereus) in flight in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Tourist photographing a wild Galapagos giant tortoise (Geochelone elephantopus) feeding on the upslope grasslands of Santa Cruz Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Juvenile Galapagos brown pelican (Pelecanus occidentalis urinator), smallest species of pelican worldwide, feeding in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp (Artemia salina) in saltwater lagoon near Cerro Dragon on Espanola Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Juvenile Galapagos brown pelican (Pelecanus occidentalis urinator), smallest species of pelican worldwide, feeding in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) showing blue feet in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos shearwater (Puffinus subalaris) nesting in lava nook in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) hauled out on the beach in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) hauled out on Isabela Island in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Blue-footed booby (Sula nebouxii) newly hatched chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) pup in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America