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A large pod of Gerlache Strait type B killer whales (Orcinus orca), traveling and socializing in Gerlache Strait, Antarctica, Polar Regions

Plains zebras (Equus quagga), Ndutu, Ngorongoro Conservation Area, Serengeti, Tanzania, East Africa, Africa

Adult black-legged kittiwake (Rissa tridactyla) in combat with a second kittiwake near Alexander Island, Franz Josef Land, Russia, Arctic Ocean, Eurasia

Adult female killer whale (Orcinus orca) surfacing in Chatham Strait, Southeast Alaska, United States of America, Pacific Ocean, North America

Adult female polar bear (Ursus maritimus) rolling in snow to clean its fur on multi-year ice floes in Franz Josef Land, Russia, Arctic Ocean, Eurasia

Humpback whale (Megaptera novaeangliae), surfacing off Half Moon Island in the South Shetland Island Group, 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 fin whale (Balaenoptera physalus) surfacing off the west coast of Spitsbergen, Svalbard, Norway, Scandinavia, Europe

Male Black-Bellied Bustard (Black-Bellied Korhaan) (Eupodotis melanogaster), Kruger National Park, South Africa, Africa

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

Adult chinstrap penguins (Pygoscelis antarctica), mating at breeding colony on Half Moon Island, Antarctica, Polar Regions

Chinstrap penguins (Pygoscelis antarctica), ecstatic display at breeding colony at Half Moon Island, Antarctica, Polar Regions

Chinstrap penguins (Pygoscelis antarctica), ecstatic display at breeding colony at Half Moon Island, Antarctica, Polar Regions

Adult chinstrap penguin (Pygoscelis antarctica), carrying rock in its beak at breeding colony at Half Moon Island, Antarctica, Polar Regions

Guadalupe fur seals (Arctocephalus townsendi), underwater on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult black-legged kittiwakes (Rissa tridactyla) resting on ice in the Svalbard Archipelago, Barents Sea, Norway, Arctic, Europe

Views of Gnalodden cliff in Hornsund, on the island of Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

Views of the Vasilievbreen (Vasiliev Glacier), in Isbukta (Ice Bay) near the island of Spitsbergen in Svalbard, Norway, Arctic, Europe

Northern fulmar (Fulmarus glacialis glacialis) on the wing over calm seas in the Svalbard Archipelago, Norway, Arctic, Europe

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

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

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

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

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

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

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

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

Adult Galapagos hawk (Buteo galapagoensis) in the Galapagos Island Archipelago, 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

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Adult Swallow-tailed gull (Creagrus furcatus) in the Galapagos Island Archipelago, 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

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

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

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

Adult Galapagos brown pelican (Pelecanus occidentalis urinator) in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Nazca booby (Sula grantii) downy chick stretching its wings to gather strength for flight in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

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

Adult bull Galapagos sea lion (Zalophus wollebaeki) posturing on Fernandina Island in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Galapagos sea lion pup (Zalophus wollebaeki) underwater with Galapagos penguin in the Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Cruise ship floating between the icebergs near the Eqi glacier, Ilulissat, Western Greenland, Denmark, Polar Regions

Aerial of a little ship floating between the ice below the Eqi glacier, Western Greenland, Denmark, Polar Regions

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

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

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

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

Guests from the Lindblad Expedition ship National Geographic Explorer kayaking in the Svalbard Archipelago, Norway, Arctic, Europe

Adult gentoo penguins (Pygoscelis papua), returning and coming from the sea at Booth Island, Antarctica, Southern Ocean, Polar Regions

African bush elephant (Loxodonta africana), feeding inside Ngorongoro Crater, Tanzania, East Africa, Africa

View of coastline and Ionian Sea near Palaiokastritsa at sunset, Palaiokastritsa, Corfu, Ionian Sea, Greek Islands, Greece, Europe

Adult South Georgia Pipit (Anthus antarcticus) feeding at low tide on Prion Island, Bay of Isles, South Georgia, Polar Regions

Antarctic fur seal pups (Arctocephalus gazella) playing in Fortuna Bay on South Georgia, Southern Ocean, Polar Regions

King penguin (Aptenodytes patagonicus) breeding and nesting colony at St. Andrews Bay on South Georgia, Southern Ocean, Polar Regions

King penguins (Aptenodytes patagonicus) swimming near the nesting beach at Salisbury Plain, South Georgia, Polar Regions

Views of the glaciers and mountains of Drygalski Fjord on the southeast side of South Georgia, Southern Ocean, Polar Regions

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

Adult Commerson's dolphin (Cephalorhynchus commersonii), surfacing in Stanley Harbor in the Falkland Islands, South America

Guadalupe fur seal (Arctocephalus townsendi), at new haul out on Las Animas Island, Baja California Sur, Sea of Cortez, Mexico, North America

Adult black-crowned night-heron (Nycticorax nycticorax falklandicus) on Carcass Island in the Falkland Islands, South America

Adult Patagonian crested duck (Lophonetta specularioides specularioides) on Carcass Island in the Falkland Islands, South America

Adult brown skuas (Catharacta antarctica) feeding on a penguin carcass near the Antarctic peninsula, Antactica, Polar Regions

Adult female leopard seal (Hydrurga leptonyx) stalking juvenile Adelie penguins on ice at Brown Bluff, Antarctic Peninsula.

Adult Weddell seal (Leptonychotes weddellii) hauled out on ice near the Antarctic Peninsula, Southern Ocean, Polar Regions

Palm trees on Yacumama Lake, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Close-up of head of Black caiman (Melanosuchus niger), Lake Yacumama, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Peruvian countryside with Andes in background, Maras, Sacred Valley, Urubamba Province, Cusco (Cuzco) Region, Peru, South America

Mountains in Sacred Valley as seen from Huayllabamba viewpoint, Sacred Valley, Urubamba Province, Cusco Region, Peru, South America

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

An adult bull among a pod of about 20 killer whales (Orcinus orca) in Antarctic Sound near the Antarctic Peninsula, Polar Regions

Adelie penguins (Pygoscelis adeliae) hauled out onto the ice near Adelaide Island, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae) on ice floe with leopard seal at Brown Bluff, Antarctica, Polar Regions

Gentoo penguin (Pygoscelis papua) chicks covered with mud and guano on Cuverville Island, Antarctica, Southern Ocean, Polar Regions

Sunset over the Bristol Channel from Dunraven Bay, Southerndown, South Wales, United Kingdom, Europe

Imperial Shags (Phalacrocorax (atriceps) atriceps) at breeding colony on small islets off the city of Ushuaia, Argentina, South America

Galapagos white-cheeked pintail (Anas bahamensis galapagensis) feeding 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) 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

Adult polar bear (Ursus maritimus) on first year sea ice in Olga Strait, near Edgeoya, Svalbard, Arctic, Norway, Scandinavia, Europe

Adult bearded seal (Erignathus barbatus) hauled out on ice in Storfjorden, Svalbard, Arctic, Norway, Scandinavia, Europe