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

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

Pregnant female southern elephant seal (Mirounga leonina) giving birth on the beach in Stromness Bay, South Georgia Island

Southern elephant seal (Mirounga leonina) pup, called weaners once their mothers stop nursing, South Georgia Island, Southern Ocean

Ciconia (stork) nest on telegraph pole, village on the road from Sibiu to Sighisoara, Transylvania, Romania

Juvenile Yellow Crowned Night Heron (Nyctanassa Violacea), wading bird found in the Americas that feeds on crustacea, Bermuda, Atlantic

Female mantled howler monkey (Alouatta palliata) eating tree leaves in a north Pacific coast forest, Esperanza, Nosara, Guanacaste, Costa Rica

Tropical Kingbird (Tyrannus melancholicus) large tyrant flycatcher, common in the southern Americas, Esperanza, Nosara, Guanacaste, Costa Rica

Broad-winged hawk (Buteo platypterus) small raptor, common in the Americas as far south as Brazil, Playa Garza, Nosara, Guanacaste, Costa Rica

Broad-winged hawk (Buteo platypterus) small raptor, common in the Americas as far south as Brazil, Playa Garza, Nosara, Guanacaste, Costa Rica

Spotted sandpiper (Actitis macularius) non-breeding plumage, common shorebird in the Americas, Nosara River, Nosara, Guanacaste, Costa Rica

Two Grey Herons (Maakana) on the edge of a swimming pool overlooking the lagoon on an exotic Island in The Maldives, Indian Ocean

An avocet (Recurvirostra avosetta), at Brownsea Island, a nature reserve in Poole Harbour, Dorset, England, United Kingdom, Europe

A Mute Swan (Cygnus olor), in the marshes at Ham Wall National Nature Reserve, one of the Avalon Marshes nature reserves, near Glastonbury, Somerset, England, United Kingdom, Europe

Atlantic Puffin (Fratercula arctica), on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Atlantic Puffin (Fratercula arctica) in its burrow on Skomer Island in July, a nature reserve off the coast of Pembrokeshire, Wales, United Kingdom, Europe

Long-tailed Silky-flycatcher (Ptiliogonys caudatus) feeding on Twoleaf nightshade berries, Costa Rica

Irrigation canal, Falaj irrigation system (Falaj Al-Khatmeen), UNESCO, palm grove, Birkat Al Mouz, Al Dakhliya region, Jebel Akhdar foothills, Oman

A juvenile killer whale (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

Gathering of at least two resident pods of killer whales (Orcinus orca) encountered near sunset, Johnstone Strait, British Columbia, Canada

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

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

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

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, Katmai National Park, Alaska, United States of America

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

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

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

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

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

Adult brown bears (Ursus arctos) courtship behaviour, Brooks River, Katmai National Park near Bristol Bay, Alaska, United States of America

Adult brown bear sow (Ursus arctos) watching human activities at the Brooks River, Katmai National Park, Alaska, United States of America

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

Adult fin whale (Balaenoptera physalus) carcass in Holmabukta off the northwest of the Svalbard Archipelago, Norway

Adult fin whale (Balaenoptera physalus) sub-surface feeding in the rich waters off the Svalbard Archipelago, Norway

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

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

Adult black-legged kittiwakes (Rissa tridactyla) in flight in the Svalbard Archipelago, Barents Sea, Norway

Two young polar bears (Ursus maritimus), feeding side-by-side on a fresh bearded seal kill on Spitsbergen, Svalbard, Norway

Two young polar bears (Ursus maritimus), feeding side-by-side on a fresh bearded seal kill on Spitsbergen, Svalbard, Norway

A mother polar bear (Ursus maritimus), and cub of the year feeding on a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Tamarix aphylla wood at the edge of the palm grove of Zagora, Draa River valley, Province of Zagora, Region Draa-Tafilalet, Morocco

A mother polar bear (Ursus maritimus), with cub of the year feeding on a fin whale carcass in Holmabukta, Svalbard, Norway

Young curious female polar bear (Ursus maritimus), on fast ice near Hinlopen Strait in the Svalbard Archipelago, Norway

Adult Eurasian oystercatcher (Haematopus ostralegus ostralegus) in full breeding plumage at Isfjardardjup, Iceland

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

Adult black-browed albatross (Thalassarche melanophrys), in flight returning to nesting site on West Point Island, Falklands, South America

Rock shag (Phalacrocorax magellanicus), pair exhibiting courtship behavior near New Island in the Falkland Islands, South America

A rare melanistic king penguin (Aptenodytes patagonicus), feeding its okum boy chick at Fortuna Bay, South Georgia Island, Polar Regions

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

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

Adult Subantarctic Skua (Catharacta antarctica lonnbergi) on tussac at Salisbury Plain on South Georgia Island, Polar Regions

Northern giant petrel (Macronectes halli) amongst king penguin chicks at Gold Harbour, South Georgia, Southern Ocean, Polar Regions

Brown capuchin monkey (Cebus apella) (Sapajus apella) on tree, Tambopata National Reserve, Puerto Maldonado, Tambopata Province, Madre de Dios, Peru, South America

Adelie penguins (Pygoscelis adeliae), at breeding colony at Brown Bluff on the eastern side of the Antarctic Peninsula, Antarctica, Polar Regions

Adult bull southern elephant seal (Mirounga leonina) fleeing from another male challenger at Gold Harbour, South Georgia, Polar Regions

Adelie penguin (Pygoscelis adeliae), feeding chick at breeding colony at Brown Bluff, Antarctic Peninsula, Antarctica, Polar Regions

Adult American black bear (Ursus americanus) near Mendenhall Glacier, Southeast Alaska, United States of America, North America

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

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

Adult black-legged kittiwakes (Rissa tridactyla) feeding at the base of a glacier in the Svalbard Archipelago, Norway, Arctic, Europe

An adult ivory gull (Pagophila eburnea) on ringed seal kill on Spitsbergen in the Svalbard Archipelago, Norway, Arctic, Europe

Adult striated Heron (Butorides striata) 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

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

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

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

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

Jungle myna (Acridotheres fuscus), looking for insects 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

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

Adult wandering albatross (Diomedea exulans) in flight near the Tristan da Cunha Group, South Atlantic Ocean

Young northern gannet (Morus bassanus) in flight near Ile des Oiseaux in the Parc National du Delta du Saloum, UNESCO World Heritage Site, Senegal, West Africa, Africa

Antarctic fur seal male and female (Arctocephalus gazella) at Stromness Bay on South Georgia, Polar Regions

King penguin (Aptenodytes patagonicus) breeding and nesting colony at Salisbury Plain in the Bay of Isles, 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

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