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Flowering prickly pear cactus (Opuntia ficus-indica), in the Sweetwater Preserve, Tucson, Arizona, United States of America, North America

An adult green sea turtle (Chelonia mydas), underwater in Fernandina Island, Galapagos, Ecuador, South America

Galapagos sea lions (Zalophus wollebaeki) on the beach in Cerro Brujo, San Cristobal Island, Galapagos, Ecuador, South America

An adult green sea turtle (Chelonia mydas) in its orange morph, Fernandina Island, Galapagos, Ecuador, South America

Adult brown-throated sloth (Bradypus variegatus), Yanayacu Lake, Rio Pacaya, Amazon Basin, Loreto, Peru, South America

Adult yellow-rumped caciques (Cacicus cela), at nest site on Belluda Cano, Amazon Basin, Loreto, Peru, South America

Adult Great blue heron (Ardea herodias), in the town of Puerto Baquerizo Moreno, Isla San Cristobal, Galapagos, Ecuador, South America

Pacific green sea turtles (Chelonia mydas) underwater on Fernandina Island, Galapagos, Ecuador, South America

Blue-footed booby (Sula nebouxii) pair in courtship display on North Seymour Island, Galapagos, Ecuador, South America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

An adult brown bear (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

Humpback whale (Megaptera novaeangliae), adult underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

A mother sea otter (Enhydra lutris) with her pup in Reid Inlet, Glacier Bay National Park, Southeast Alaska, United States of America, North America

An adult lioness (Panthera leo) with playful cub along the Luangwa River in South Luangwa National Park, Zambia, Africa

Transient type killer whale (Orcinus orca), spy-hopping in Monterey Bay National Marine Sanctuary, California, United States of America, North America

Short-finned pilot whale (Globicephala macrorhynchus), underwater off Isla San Marcos, Baja California Sur, Mexico, North America

An adult Cape giraffe (Giraffa camelopardalis giraffa), in the Save Valley Conservancy, Zimbabwe, Africa

Adult female greater kudus (Tragelaphus strepsiceros), with young in the Save Valley Conservancy, Zimbabwe, Africa

Adult lioness (Panthera leo), with cub on a fresh kill at night in the Save Valley Conservancy, Zimbabwe, Africa

View of Victoria Falls on the Zambezi River, UNESCO World Heritage Site, straddling the border of Zambia and Zimbabwe, Africa

Adult white-throated savanna monitor (Varanus albigularis), head detail, Save Valley Conservancy, Zimbabwe, Africa

Early light on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

Adult hoary marmot (Marmota caligata), on the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

Temperate rain forest on the Maple Glade Trail, Quinault Rain Forest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Waterfall on the Marymere Falls Trail, Quinault Rain Forest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Old Chevrolet truck at the Kestner Homestead, Quinault Rain Forest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Captive scarlet ibis (Eudocimus ruber), Parque das Aves, Foz do Iguacu, Parana State, Brazil, South America

Young southern elephant seal bulls (Mirounga leoninar), molting on the beach in Gold Harbor, South Georgia, Polar Regions

The stone formation Tres Marias, Valle de le Luna, Los Flamencos National Reserve, Antofagasta Region, Chile, South America

Olive baboons (Papio anubis) grooming each other in Ngorongoro Conservation Area, Tanzania, East Africa, Africa

Olive baboons (Papio anubis) grooming each other in Ngorongoro Conservation Area, Tanzania, East Africa, Africa

California gulls (Larus californicus) feeding on tuna crabs, Isla Magdalena, Baja California Sur, Mexico, North America

An adult great egret (Ardea alba) in flight in San Jose del Cabo, Baja California Sur, Mexico, North America

Juvenile yellow-footed gull (Larus livens), eating a goatfish, Isla San Ildefonso, Baja California, Mexico, North America

Ashy morph of the Santa Catalina rattlesnake (Crotalus catalinensis), endemic to Isla Santa Catalina, Baja California Sur, Mexico, North America

Adult Munk's pygmy devil ray (Mobula munkiana), leaping into the air, Ensenada Grande, Isla Partida, Baja California Sur, Mexico, North America

A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America

Organ pipe cactus (Stenocereus thurberi), Organ Pipe Cactus National Monument, Sonoran Desert, Arizona, United States of America, North America

A young whale shark (Rhincodon typus), near kayaker in Bahia Coyote, Conception Bay, Baja California Sur, Mexico, North America

View of the Colorado River from the Glen Canyon Dam Bridge on Highway 89, Arizona, United States of America, North America

Black-browed albatross (Thalassarche melanophris), in flight in Drake Passage, Antarctica, Polar Regions

The Argentine Research Station Almirante Brown, located in Paradise Harbor, Antarctica, Polar Regions

Polar bear cubs of the year (Ursus maritimus), foraging for food with mother nearby, Cape Brewster, Greenland, Polar Regions

An adult crabeater seal (Lobodon carcinophaga), hauled out on the ice in Antarctic Sound, Weddell Sea, Antarctica, Polar Regions

An adult crabeater seal (Lobodon carcinophaga), hauled out on the ice in Antarctic Sound, Weddell Sea, Antarctica, Polar Regions

Ecotype Big B killer whale (Orcinus orca), surfacing amongst ice floes in Lemaire Channel, Antarctica, Polar Regions

An adult leopard seal (Hydrurga leptonyx), hauled out on an ice floe at Booth Island, Antarctica, Polar Regions

Ventifacts blown by the wind into the soft tuff material at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Interior view of Port Lockroy, established as Station A in WWII Operation Tabarin, Goudier Island, Antarctica, Polar Regions

Porcelain Basin, in the Norris Geyser Basin area, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Washakie Wilderness area within Shoshone National Forest, Wyoming, United States of America, North America

Echinus Spring in the Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Snow-capped mountains and a frozen lake near Beartooth Pass, Wyoming, United States of America, North America

Adult female green kingfisher (Chloroceryle americana), on the Rio Negro, Mato Grosso, Pantanal, Brazil, South America

Rare James's flamingo (Phoenicoparrus jamesi), Eduardo Avaroa Andean Fauna National Reserve, Bolivia, South America

Laguna Verde in the Eduardo Avaroa Andean Fauna National Reserve, Potosi Department, Bolivia, South America

Adult blue-footed boobies (Sula nebouxii,) nest exchange at Punta Pitt, San Cristobal Island, Galapagos, Ecuador, South America

A small group of Dall sheep (Ovis dalli) grazing on a mountainside in Denali National Park, Alaska, United States of America, North America

Adelie penguin (Pygoscelis adeliae) parent feeding chick at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Adelie penguins (Pygoscelis adeliae), leaping near breeding colony, Heroina Island, Danger Island Group, Antarctica, Polar Regions

The remains of an old British Base at Deception Island, an active volcano which last erupted in 1969, Antarctica, Polar Regions

Adult fin whale (Balaenoptera physalus), feeding on krill near Coronation Island, South Orkney Islands, Antarctica, Polar Regions

A young emperor penguin (Aptenodytes forsteri), near Adelie and gentoo penguins on Pleneau Island, Antarctica, Polar Regions

An adult gentoo penguin (Pygoscelis papua), with chicks at Brown Bluff, Antarctic Sound, Antarctica, Polar Regions

Curious type B2 killer whale (Orcinus orca), inspecting the ship in the Errera Channel, Antarctica, Polar Regions

A leucistic Antarctic fur seal (Arctocephalus gazella), pup playing with normal pup in Grytviken, South Georgia, South Atlantic, Polar Regions

Adult gentoo penguins (Pygoscelis papua), on the beach at daybreak at Gold Harbor, South Georgia, South Atlantic, Polar Regions

Adult South Georgia pintail (Anas georgica georgica), swimming in a freshwater pond, Moltke Harbor, South Georgia, South Atlantic, Polar Regions

Southern elephant seals (Mirounga leonina), on the beach at Gold Harbour, South Georgia, South Atlantic, Polar Regions

Black-browed albatross (Thalassarche melanophris), chicks at breeding colony on Saunders Island, Falklands, South America

Gentoo penguin (Pygoscelis papua), adults coming back from feeding at sea on the beach at New Island, Falklands, South America

The Milky Way at night at the Vlamingh Head Lighthouse, Exmouth, Western Australia, Australia, Pacific

Short-beaked echidna (Tachyglossus aculeatus), crossing the road, Cape Range National Park, Western Australia, Australia, Pacific

Adult olive-headed sea snake (Hydrophis major), swimming on Ningaloo Reef, Western Australia, Australia, Pacific

Adult whale shark (Rhincodon typus), underwater on Ningaloo Reef, Western Australia, Australia, Pacific

Humpback whale (Megaptera novaeangliae), mother and calf underwater, Ningaloo Reef, Western Australia, Australia, Pacific

Tourists taking an ice tour in a small boat watching icebergs from the Ilulissat Icefjord, just outside Ilulissat, Greenland, Denmark, Polar Regions

An adult toco toucan, Ramphastos toco, perched on a tree limb, Iguazú Falls, Misiones Province, Argentina.

Frieze outside the Great Temple of Abu Simbel, with its four iconic 20 meter tall seated colossal statues of Ramses II (Ramses The Great), UNESCO World Heritage Site, Abu Simbel, Egypt, North Africa, Africa

California gray whale calf (Eschrictius robustus), and tourist's hand in San Ignacio Lagoon, Baja California, Mexico, North America

The Petra Monastery (Al Dayr), Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

On the path to The Petra Monastery (Al Dayr), Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

Camel and rider, Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

Adult male magnificent frigatebird (Fregata magnificens), on its nest, Iguana Island, Panama, Central America

Toco toucan (Ramphastos toco), feeding within Iguazu Falls National Park, Misiones, Argentina, South America

Yellowstone waterfall during a snowstorm in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An adult yellow-bellied marmot (Marmota flaviventris), in Yellowstone National Park, Wyoming, United States of America, North America

Brown pelican (Pelecanus occidentalis) portrait at Isla Angel de la Guarda, Baja California, Mexico, North America

Osprey (Pandion haliaetus) taking flight with fish near Honeymoon Bay, Isla Danzante, Baja California Sur, Mexico, North America

Long-beaked common dolphin (Delphinus capensis) leaping near Isla Santa Catalina, Baja California Sur, Mexico, North America

Jordanian horse, Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

A boy with a camel, the Petra Treasury (Al-Khazneh), Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East

The Petra Treasury (Al-Khazneh), Petra Archaeological Park, UNESCO World Heritage Site, one of the New Seven Wonders of the World, Petra, Jordan, Middle East