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Hoatzin (Ophisthocomus hoazin) perching on branch by Lake Sandoval, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Boojum tree (Fouquieria columnaris), just outside Bahia de los Angeles, Baja California, Sea of Cortez, Mexico, North America

Stunning mountainous landscape of Kyrgyzstan illuminated by fading sunlight and shadowy clouds, Kyrgyzstan, Central Asia, Asia

Adult snow petrel (Pagodroma nivea nivea), in flight near the Antarctic Peninsula, Antarctica, Southern Ocean, Polar Regions

A pod of killer whales (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Adult male polar bear (Ursus maritimus) on multi-year ice floes in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult female polar bear (Ursus maritimus) walking on multi-year ice floes in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Curious crabeater seals (Lobodon carcinophaga), swimming near iceberg at Booth Island near the Antarctic Peninsula, Polar Regions

Southern elephant seals (Mirounga leonina), hauled out for their annual catastrophic molt (moult) on the beach at Snow Island, Antarctica, Polar Regions

Southern elephant seals (Mirounga leonina), hauled out for their annual catastrophic molt (moult) on the beach at Snow Island, Antarctica, Polar Regions

Adult gentoo penguin (Pygoscelis papua), leaping off ice shelf at Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Views of Austfonna, an ice cap located on Nordaustlandet in the Svalbard archipelago in Norway, Arctic, Europe

Views of Austfonna, an ice cap located on Nordaustlandet in the Svalbard archipelago in Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Brunnich's guillemot (Uria lomvia) breeding and nesting site at Cape Fanshawe in the Svalbard Archipelago, Norway, Arctic, Europe

Adult glaucous gull (Larus hyperboreus) eating common eider duckling (Somateria mollissima) in Svalbard, Norway, Arctic, Europe

Adult female common eider ducks (Somateria mollissima) swimming with ducklings of Edgeoya in Svalbard, Norway, Arctic, Europe

Common guillemot (Uria aalge) nesting on Bear Island (Bjornoya) in the Svalbard Archipelago, Norway, Arctic, Europe

The Global Seed Vault just outside the town of Longyearbyen on the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

An adult polar bear (Ursus maritimus) leaping from ice floe to ice floe in the Svalbard Archipelago, Norway, Arctic, Europe

An adult polar bear (Ursus maritimus) leaping from ice floe to ice floe in the Svalbard Archipelago, Norway, Arctic, Europe

An adult polar bear (Ursus maritimus) on ice floe under bright sun burst in the Svalbard Archipelago, Norway, Arctic, Europe

An adult Sabine's Gull (Xema sabini) in melt water pool in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Curious adult bull walrus (Odobenus rosmarus rosmarus) approach the ship at Moffen Island in the Svalbard Archipelago, Norway, Arctic, Europe

Adult bull walrus (Odobenus rosmarus rosmarus) hauled out on the beach in the Svalbard Archipelago, Norway, Arctic, Europe

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing within the town limits of Longyearbyen, Spitsbergen, Svalbard, Norway, Arctic, Europe

Adult Svalbard reindeer (Rangifer tarandus platyrhynchus) grazing on tundra in the Svalbard Archipelago, Norway, Arctic, Europe

Donkey cart, sugar cane harvest, Ramadi village, west bank of the Nile south of Edfu, Egypt, North Africa, Africa

Tractor, sugar cane harvest, Ramadi village, west bank of the Nile south of Edfu, Egypt, North Africa, Africa

Great frigatebird (Fregata minor) feeding on erupting green sea turtle (Chelonia mydas) hatchlings in the Galapagos, 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

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

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

Lava lizard (Microlophus spp) in the Galapagos Islands 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

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, 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) swimming in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult great blue heron (Ardea herodias cognata) feeding on green sea turtle hatchlings, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Spotted eagle ray (Aetobatus narinari) underwater at Leon Dormido Island off San Cristobal Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Fruits of Acacia, Botanical Garden on El Nabatat Island (Kitchener's Island), Aswan, Egypt, North Africa, Africa

Playa El Holandes, Cabo San Antonio, Guanahacabibes Peninsular, National Park and Biosphere Reserve, Pinar del Rio Province, Cuba, West Indies, Central America

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

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

Adult waved albatross (Diomedea irrorata) at breeding colony on Espanola Island, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

An Atlantic Puffin (Fratercula arctica), on a cliff edge in Borgarfjaroarhofn, Iceland, Polar Regions

Greater flamingo (Phoenicopterus ruber) in flight over saltwater lagoon in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

A pair of Atlantic Puffins (Fratercula arctica), on a hilltop in Borgarfjaroarhofn, Iceland, Polar Regions

A pair of Atlantic Puffins (Fratercula arctica), on a cliff edge in Westman Islands, Iceland, Polar Regions

Galapagos penguin (Spheniscus mendiculus) feeding underwater on small baitfish in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Adult Nazca booby (Sula grantii) courtship behavior in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

Adult red-footed booby (Sula sula) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Painted Locust (Schistocerca melanocera) mating in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Painted Locust (Schistocerca melanocera) mating in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion bulls (Zalophus wollebaeki) mock-fighting in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

The white and black sand beach and estuary at Talisker with Preshal More beyond, both SSSI locations for the Tertiary basalt lava geology and biological habitats, Talisker Bay, Carbost, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Young Galapagos sea lions (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Young Galapagos sea lion (Zalophus wollebaeki) at play underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

A view of the Mitchell River meandering towards Swift Bay as seen from a commercial helicopter, Kimberley, Western Australia, Australia, Pacific

A myriad of hard and soft corals, as well as tropical reef fish on the healthy reef near Volivoli Resort on Viti Levu, Fiji, South Pacific, Pacific

Adult gentoo penguin (Pygoscelis papua), porpoising for swimming speed near the Antarctic Peninsula, Southern Ocean, Polar Regions

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer in the Svalbard Archipelago, Norway, Arctic, Europe

The Lindblad Expeditions ship National Geographic Sea Bird operating in Glacier Bay National Park, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Aerial of the Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Floating icebergs, Ilulissat Icefjord, UNESCO World Heritage Site, Western Greenland, Denmark, Polar Regions

Sierra del Rosario Biosphere Reserve, Artemisa Province, Cuba, West Indies, Caribbean, Central America

Playa Caleta Larga, Cabo San Antonio, Guanahacabibes Peninsula National Park and Biosphere Reserve, Pinar del Rio, Cuba, West Indies, Caribbean, Central America

A Balkan marbled white (Melanargia larissa) butterfly on flower, Serifos Island, Cyclades, Greek Islands, Greece, Europe

Adult yellow-lipped sea krait (Laticauda colubrina) snake, at night on the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Red mangrove plants (Rhizophora mangle), at low tide near the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific