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People watching Arak tree (Salvadora persica) at the foot of a fault in sandstone wall, Sharaan Nature Reserve, AlUla, Medina Province, Saudi Arabia

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

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Adult killer whale (Orcinus orca) surfacing with kelp on its flukes in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Pack Ice Type B killer whales (Orcinus orca), finding a leopard seal (Hydrurga leptonyx), on an ice floe in Antarctica, Polar Regions

Living crocodiles for sale at the market of Mbandaka, Equateur province, Democratic Republic of Congo, Africa

Curious walrus (Odobenus rosmarus rosmarus) near Apollo Island in Franz Josef Land, Russia, Arctic Ocean, Eurasia

View of calm seas and icebergs with reflected mountains surrounding Damoy Point in Dorian Bay, Antarctica, Polar Regions

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

The endemic Galapagos marine iguana (Amblyrhynchus cristatus) feeding underwater in the Galapagos, 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 very colorful Galapagos land iguana (Conolophus subcristatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Scene of the fish market in the port town of Puerto Ayora, Santa Cruz Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Greater flamingo (Phoenicopterus ruber) foraging for small pink shrimp in saltwater lagoon in the Galapagos Islands, 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

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

A myriad of hard and soft corals at Vatu-I-Ra Conservation Park 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

Arctic birds on an Iceberg on Belcher island, Devon island, Nunavut, Canadian Arctic, Canada, North America

Arctic birds on an Iceberg on Belcher island, Devon island, Nunavut, Canadian Arctic, Canada, North America

A growth of Acropora species, and one Goniastrea species (centre) scleractinic hard corals, on a coral reef in Gaafu Dhaalu atoll, Maldives

Heteractis species sea anemone guarded by Clownfish (Amphiprion species) on a coral reef in Gaafu Dhaalu atoll, Maldives

Alpine wildflower meadows with fireweed (Chamaenerion angustifolium) along the Ptarmigan Cirque Trail in summer, Kananaskis Country, Alberta, Canadian Rockies, Canada, North America

View of the volcanic shoreline on Tristan da Cunha, the most remote inhabited location on Earth, Tristan da Cunha, South Atlantic Ocean

Caspian Terns (Hydroprogne caspia) at breeding colony on Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Antarctic fur seal pup (Arctocephalus gazella) on Prion Island in the Bay of Isles on South Georgia, Southern Ocean, Polar Regions

Adelie penguins (Pygoscelis adeliae), in snow storm at breeding colony at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

A lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica, Polar Regions

Neotropic cormorant (Phalacrocorax brasilianus) (Phalacrocorax olivaceus) (Nannopterum brasilianum), Lake Sandoval, Tambopata National Reserve, Peru, South America

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

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

Checkerboard Mesa, a sandstone peak standing 900 feet high, in Kane County, Zion National Park, Utah, United States of America, North America

A myriad of hard and soft corals compete for space on the substrate of the snorkel site known as the Milky Way, Palau, Micronesia, Pacific

Old adobe village in ruins of Al Ain, perched villages of Jabal Al Akhdar (Green Mountains), Sayq Plateau, Sultanate of Oman, Arabian Peninsula

Adult female upland goose (Chloephaga picta) with goslings on Carcass Island in the Falkland Islands

Southern Right Whale (Eubalaena australis) mother and calf being harassed by kelp gull, Peninsula Valdez, Argentina

Nurse shark (Ginglymostoma cirratum), on the sand in Hol Chan Marine Preserve, inside the Mesoamerican Barrier Reef, Belize

Northern (Steller) sea lions, (Eumetopias jubatus), hauled out on South Marble Island, Glacier Bay National Park, Alaska, United States of America

Volcanic landscape with small plants in the Timanfaya national park in Lanzarote in the Canary Islands, Spain

Lake Sandoval and Aguaje palms, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Icebergs near the Antarctic Peninsula during the summer months, Antarctica, Southern Ocean, Polar Regions

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

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on Genovesa (Tower) Island, Galapagos, UNESCO World Heritage Site, Ecuador, South America

Adult yellow warbler (Dendroica petechia aureola) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male Great frigatebird (Fregata minor) in breeding plumage with red gular pouch, on North Seymour Island, Galapagos Islands, UNESCO World Heritage Site, Ecaudor, South America

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

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 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

Alpine wildflower meadows with pasqueflower seedheads along the Ptarmigan Cirque Trail in summer, Kananaskis Country, Alberta, Canadian Rockies, Canada, North America

A dawn view of Boatswain Bird Island just off Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

View of the old barracks atop Green Mountain on Ascension Island in the southern tropical Atlantic Ocean, South Atlantic Ocean

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

King penguins (Aptenodytes patagonicus) in downy plumage (okum boys) on South Georgia Island, Polar Regions

Adult brown bear (Ursus arctos) foraging for salmon at the Brooks River, Katmai National Park, Alaska, United States of America

Lake Sandoval and Aguaje palms, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

Great frigatebird chick (Fregata minor) on the nest on North Seymour Island 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

Male Great frigatebird (Fregata minor) in flight against the nearly full moon on Genovesa (Tower) Island, Galapagos Islands, 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 red-footed booby (Sula sula) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

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

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

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 at Vatu-I-Ra Conservation Park on Viti Levu, Fiji, South Pacific, Pacific

White-faced heron (Egretta novaehollandiae), in flight at the Volivoli Resort grounds on Viti Levu, Fiji, South Pacific, Pacific

Polar bear (Ursus Maritimus) on Axel Heiberg island, Nunavut, Canadian Arctic, Canada, North America

View of Tristan da Cunha, the most remote inhabited location on Earth, Tristan da Cunha, South Atlantic Ocean

Views of visitor lodging on Ile des Oiseaux (Bird Island) in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Striated caracara (Phalcoboenus australis) feather detail, on Carcass Island in the Falkland Islands, South Atlantic Ocean, South America

Mountain in Valle Rojo (Red Valley), near Rainbow Mountain, Pitumarca District, Cusco (Cuzco), Peru, 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

Great frigatebird (Fregata minor) chick in the nest in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male great frigatebird (Fregata minor) in breeding plumage in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Male great frigatebird (Fregata minor) in breeding plumage in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion (Zalophus wollebaeki) pup and curious bird, Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America