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Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

Green sea turtle (Chelonia mydas), surfacing for air near Caye Caulker, inside the Mesoamerican Barrier Reef, Belize

A myriad of fish and coral underwater at Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Adult sea otter (Enhydra lutris kenyoni) mother and pup in Inian Pass, Southeastern Alaska, United States of America

Locals in a canoe on the Sangha river, Dzanga Sangha National Park, UNESCO, Central African Republic

Adult humpback whales (Megaptera novaeangliae) co-operatively bubble-net feeding in Southeast Alaska, United States of America

Harbor seal (Phoca vitulina) hauled out on submerged log in Misty Fjords National Monument, Southeast Alaska, United States of America

A large stand of Arctic cotton (Eriophorum callitrix) in Denali National Park, Alaska, United States of America

A large stand of Arctic cotton (Eriophorum callitrix) in Denali National Park, Alaska, United States of America

Local tribal women gather near the 322 feet Hundru waterfall to feast Shiva, the Supreme being in Hindu Shaivism, and beseech health and strength for their menfolk, Ranchi, Jharkhand, India, Asia

Ice formation on top of a rock in the Arctic landscape, Flakstadoya, Nordland, Lofoten Islands, Norway, Scandinavia, Europe

Mexican giant cardon (Pachycereus pringlei), on Isla San Esteban, Baja California, Sea of Cortez, Mexico, North America

A tube anemone grows on a sandy seafloor in Komodo National Park, Indonesia. This tropical area in the western Pacific harbors an extraordinary array of marine organisms.

A large roughtail stingray (Dasyatis centroura) rests on the seafloor near Turneffe Atoll, Belize. This species is found throughout much of the Atlantic near reefs.

A yellow stingray (Urobatis jamaicensis) lays on the sandy seafloor of Turneffe Atoll in Belize. This small and beautiful elasmobranch ranges throughout the Caribbean Sea.

Adult king penguins (Aptenodytes patagonicus) returning to sea from the nesting colony at Salisbury Plain, South Georgia, Polar Regions

Macaroni penguins (Eudyptes chrysolophus) scrambling up steep cliffs at Hercules Bay on South Georgia Island, Polar Regions

Beachmaster bull southern elephant seal (Mirounga leonina) attempting to mate at Peggotty Bluff, South Georgia, Polar Regions

Adelie penguins (Pygoscelis adeliae), with chinstrap penguins (Pygoscelis antarctica), on ice at Booth Island, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae), leaping into the sea at Booth Island, Antarctica, Polar Regions

Views of the abandoned whaling station in Stromness Bay on South Georgia in the Southern Ocean, Polar Regions

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

Several species of gull feeding on small baitfish in Snow Pass, Southeast Alaska, United States of America, North America

Mushrooms growing in the Tongass National Forest in southeast Alaska, Pacific Ocean, United States of America, North America

View of Theologos village from elevated position, Theologos, Thassos, Aegean Sea, Greek Islands, Greece, Europe

Adult black-legged kittiwake (Rissa tridactyla) in aerial combat against another kittiwake near Alexander Island, Russia, Eurasia

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

Aerial view taken by drone of iceberg in Fjallsjokull Glacier Lagoon during a summer day, Iceland, Polar Regions

View of Kavala, Kavala, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Greece, Europe

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

Adult gentoo penguin (Pygoscelis papua), amongst Adelie penguins (Pygoscelis adeliae), at Brown Bluff, Antarctica, Polar Regions

A curious young polar bear (Ursus maritimus) on the ice in the Svalbard Archipelago, Norway, Arctic, Europe

A juvenile polar bear (Ursus maritimus) skull, possibly predated by adult polar bear, in the Svalbard Archipelago, Norway, Arctic, Europe

Great frigatebird (Fregata minor) in flight near guests on North Seymour 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) swimming 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) with a lava lizard on top of its head, 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

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

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

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

Adult striated Heron (Butorides striata) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult green sea turtle (Chelonia mydas agassizii) underwater in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Flightless cormorant (Nannopterum harrisi) perching on Zodiac in the Galapagos Island Group, UNESCO World Heritage Site, Ecuador, South America

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

An Atlantic Puffin (Fratercula arctica), atop a cliff with an Iceland gull (Larus glaucoides), soaring above in Westman Islands, Iceland, Polar Regions

Unusual dinghy driving in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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) pair in courtship in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos penguin (Spheniscus mendiculus) hauled out on lava 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) returning to the nest site with nest building material in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Painted Locust (Schistocerca melanocera) mating 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

An adult Galapagos dove (Zenaida galapagoensis) on Espanola Island 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

Galapagos sea lion mother nursing pup (Zalophus wollebaeki) 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

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

Landscape scarred by mining and spoil heaps at former mining settlement where gold and other minerals were extracted, and second highest village in Scotland, Leadhills, South Lanarkshire, Scotland, United Kingdom, Europe

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

Breeding pair of Shags (Gulosus aristotelis) by their nest on cliffs at Braes peninsula, a red listed bird, The Braes, Portree, Skye, Inner Hebrides, Scotland, United Kingdom, Europe

A view of a minor waterfall on the Mitchell River viewed from a helicopter, Kimberley, Western Australia, Australia, Pacific

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

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

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

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

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

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

A myriad of hard and soft corals, as well as tropical reef fish at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

The Lindblad Expedition ship National Geographic Explorer near glacial run-off in the Svalbard Archipelago, Norway, Arctic, Europe