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A huge giant clam, Tridacna gigas, grows on a shallow coral reef amid the tropical islands of Raja Ampat, Indonesia.

A juvenile painted spiny lobster, Panulirus versicolor, crawls out of a reef crevice amid the islands of Raja Ampat, Indonesia.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

A well-camouflaged flasher scorpionfish, Scorpaenopsis macrochir, lies on a black sand slope just outside of Komodo National Park, Indonesia.

A cute red-spotted blenny, Blenniella chrysospilos, looks out from its protective home on a coral reef in Indonesia. This combtooth blenny feeds on algae.

A huge whale shark, Rhincodon typus, swims in sunlit Indonesian waters. This massive yet harmless shark feeds on planktonic organisms and can sometimes be found swimming near fishing platforms due to the scent of fish.

Detail of a bulbed anemone, Entacmaea quadricolor, on a coral reef in Komodo National Park, Indonesia.

A barred-fin moray eel, Gymnothorax zonipectus, is found on a coral reef in Komodo National Park, Indonesia.

Detail of a reef-building coral colony, Favia sp., growing on a healthy reef in Komodo National Park, Indonesia.

A starry night octopus, Callistoctopus luteus, searches for prey on a reef flat at night in Raja Ampat, Indonesia.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

A black-banded sea krait, Laticauda semifasciata, swims over beautiful corals off the remote island of Manuk in the Banda Sea, Indonesia. This volcanic island is known as the island of the snakes.

Alerted springboks (Antidorcas marsupialis) watching a lioness (Panthera leo) walking, Nxai Pan National Park, Botswana, Africa

Landscape view of a river and mountain in the background covered in snow during winter, Italy, Europe

View across wooded landscape to the Roccia dell'Orso (Bear Rock), evening, Capo d'Orso, Palau, Sassari, Sardinia, Italy, Mediterranean, Europe

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

Aerial view of Kok-Moinok Canyon, a clay-sand structure formed on the slopes of arid mountains cut by water streams, Kyrgyzstan, Central Asia, Asia

A view of the upper and lower Mitchell Bay waterfalls, Kimberley, Western Australia, Australia, Pacific

River rapids at the Miabi water reservoir, Mbuji Mayi, Eastern Kasai, Democratic Republic of Congo, Africa

View across clear turquoise water to rocky headland at northern end of the Spiaggia Rosa, Budelli Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

View from rocks across the clear turquoise waters of Cala Corsara to the pink granite headland of Punta Rossa Corsara, Spargi Island, La Maddalena Archipelago National Park, Sassari, Sardinia, Italy, Mediterranean, Europe

A view of South Marble Island in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Southeast Alaska, United States of America, North America

Scenic mountain landscape with lush greenery and snow-capped peaks above Kol Ukok Lake, Kyrgyzstan, Central Asia, Asia

North view of Grand Canyon South Rim Arizona from the top floor of the historic Watchtower, taken through glass window, Grand Canyon, UNESCO World Heritage Site, Arizona, United States of America, North America

Woman and man admiring the beaches of Arrecifes, Tayrona National Natural Park, Department of Magdalena, Caribbean Region, Colombia, South America

The view of Goring weir and lock from Goring and Streatley Bridge, Goring, Oxfordshire, England, United Kingdom, Europe

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

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) yawning with mouth open on multi-year ice floes in Franz Josef Land, Russia, Eurasia

Aerial abstract view taken by drone of the textured river along the Icelandic southern coast, Iceland, Polar Regions

Climbing to an observation post over the forest canopy, French Guiana, Overseas department and region of France, French Guiana, South America

Alpine forest with towering mountains of the Italian Alps at Monte Rosa, Alagna Valsesia, Piedmont, Italy, 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

A birdseye view of Svinafellsjokull Glacier fragments in a lagoon in southern Iceland, Polar Regions

Dry stone wall and towering cliffs of basalt lava over Jurassic sediments at the Quiraing, a famous hike and scenic attraction in the far north east of the island, Quiraing, Staffin, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

Crumbling cliffs in the landslide landscape of the Quiraing, the famous hike and scenic attraction in the far north east of the island, Quiraing, Staffin, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

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

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

Guests from the Lindblad Expeditions ship National Geographic Sea Bird during Zodiac operations in Tracy Arm, Southeast Alaska, United States of America, North America

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

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

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

Hiking trail in alpine landscape facing Monte Rosa with moraine landscape, Italian Alps, Italy, Europe

Mule Deer Doe (Odocoileus hemionus) in the summer forest, Kananaskis, Alberta, Canada, North America

Cliff views just south of Naji Point on the North Rim of Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Kol-Ukok mountain lake at sunset surrounded by green mountains under a cloudy sky, Kyrgyzstan, Central Asia, Asia

Kol-Ukok Mountain Lake at sunrise surrounded by green mountains under a blue sky, Kyrgyzstan, Central Asia, Asia

Aerial view of forest near Bansko, Pirin National Park, UNESCO World Heritage Site, Bulgaria, Europe

Tre Cime (Drei Zinnen), Tre Cime Nature Preserve (Parco Naturale Tre Cime), UNESCO World Heritage Site, Dolomites, Italy, Europe

Leucistic caused by lack of melanin, or blond Antarctic fur seal pup (Arctocephalus gazella) on South Georgia, Polar Regions

Herd of wild and semi-wild Yilki horses at sunset, Hacilar, Kayseri, Cappadocia, Anatolia, Turkey, Asia Minor, Asia

Valley and mountains in the Andes near Rainbow Mountain, Pitumarca District, Cusco (Cuzco) Region, Peru, South America, South America

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

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

Forest slopes in front of the summit, Mount Fujiyama (Mount Fuji), UNESCO World Heritage Site, iconic volcano in autumn, Honshu, Japan, Asia