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

First year Adelie penguin (Pygoscelis adeliae) chicks at breeding colony at Brown Bluff, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua) nesting colony almost buried by snow during snow storm at Brown Bluff, Antarctica, Polar Regions

King penguin (Aptenodytes patagonicus) breeding and nesting colony on South Georgia Island, Southern Ocean, Polar Regions

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

Creative motion blur image of adult king penguins (Aptenodytes patagonicus) returning to the sea on South Georgia, Polar Regions

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

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

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

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

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

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

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

Sunrise on king penguins (Aptenodytes patagonicus) at nesting and breeding colony at Salisbury Plain, South Georgia, Polar Regions

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

King penguin (aptenodytes patagonicus) st andrews bay, south georgia, small group in snowy landscape

King penguins (aptenodytes patagonicus) right whale bay, south georgia, group huddled together in blizzard

King penguins (aptenodytes patagonicus) right whale bay, south georgia, group huddled together in snowy landscape

King penguin (aptenodytes patagonicus) st andrews bay, south georgia, small group in snowy landscape

King penguin (aptenodytes patagonicus) st andrews bay, south georgia, small group in snowy landscape

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Polar bears (Ursus maritimus) adult and cub in snow. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Adult female leopard seal (Hydrurga leptonyx) with Lindblad Expedition guests at Brown Bluff near the Antarctic Peninsula, Southern Ocean

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Lindblad Expeditions guests on board the National Geographic Explorer with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice, Antarctica

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Ice in all of its myriad forms in the Svalbard Archipelago, Norway. MORE INFO Global climate change is affecting the formation and duration of ice in all its form here in Svalbard.

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Guests from the Lindblad Expedition ship National Geographic Explorer take the Polar Plunge off ice floe in the Weddell Sea, Antarctica, Southern Ocean

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

Adult polar bear (Ursus maritimus) reflected in melt water pool on multi-year ice floes in the Barents Sea off the eastern coast of Edgeÿya (Edge Island) in the Svalbard Archipelago, Norway. (rr)

A well-scarred old male polar bear (Ursus maritimus) defending a fresh kill against an intruder, Monacobreen Glacier, Spitsbergen, Norway

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

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

Self-portrait with aurora borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

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

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Aurora Borealis (Northern (Polar) Lights) and waxing moon over the boreal forest outside Yellowknife, Northwest Territories, Canada

Aurora Borealis (Northern (Polar) Lights) detail over the boreal forest outside Yellowknife, Northwest Territories, Canada

Aurora Borealis (Northern (Polar) Lights) and waxing moon over the boreal forest outside Yellowknife, Northwest Territories, Canada

Polar bears (Ursus maritimus) adult and cub swimming. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Curious Polar bear (Ursus maritimus) looking up at National Geographic Explorer, Spitsbergen, Svalbard Archipelago, Norway

Fog and a fog bow surround the Lindblad Expeditions ship National Geographic Explorer in Palanderbutka, Nordaustlandet, in the Svalbard Archipelago, Norway

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

Lindblad Expeditions guests with a lone adult emperor penguin (Aptenodytes forsteri) on sea ice in the Gullet between Adelaide Island and the Antarctic Peninsula, Antarctica.

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

Polar bear (Ursus maritimus) adult on snow, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Aurora Borealis (Northern (Polar) Lights) with truckers lights on the ice road outside Yellowknife, Northwest Territories, Canada

Polar bears (Ursus maritimus) adult and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Lindblad Expeditions guests doing the "polar Plunge" in Port Foster near Whalers Bay inside the caldera on Deception Island, South Shetland Island Group, Antarctica. NO MODEL RELEASES FOR THIS IMAGE.

Aurora Borealis (Northern (Polar) Lights) with truckers lights on the ice road outside Yellowknife, Northwest Territories, Canada

Polar bears (Ursus maritimus) adult and cub swimming. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Polar bears (Ursus maritimus) adults and cub hunting, Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

A younger polar bear (Ursus maritimus) scavenging a fresh bearded seal kill, Monacobreen Glacier, Spitsbergen, Norway

Polar bear (Ursus maritimus) adult with seal kill. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Lindblad Expeditions staff member Lisa Trotter next to a HUGE adult male leopard seal (Hydrurga leptonyx) hauled out on the beach at Salisbury Plains in the Bay of Isles, Southern Ocean

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

Fog and a fog bow surround the Lindblad Expeditions ship National Geographic Explorer in Palanderbutka, Nordaustlandet, in the Svalbard Archipelago, Norway

A well-scarred old male polar bear (Ursus maritimus) on a fresh bearded seal kill near Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Polar bears (Ursus maritimus) adult and cub swimming. Monacobreen Glacier, Spitsbergen in the Svalbard Archipelago, Norway

Northern lights, Aurora Borealis, on board the Clipper Adventurer. Kangerlussuaq, Sondre Stromfjord, Greenland (Denmark), North America

Arctic Skua surveys the pack ice for food with the surrounding mountain range in the background, Svalbard Arctic

Crabeater seal (Lobodon carcinophaga) hauled out on ice floe near the Antarctic Peninsula, Antarctica

Two young polar bears (Ursus maritimus) disputing feeding rights on a fresh bearded seal kill, Spitsbergen, Norway

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

A curious young polar bear (Ursus maritimus) approaches the National Geographic Explorer, Spitsbergen, Norway

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Aurora Borealis (Northern (Polar) Lights) over the boreal forest outside Yellowknife, Northwest Territories, Canada

Ice in all of its myriad forms in the Svalbard Archipelago, Norway. MORE INFO Global climate change is affecting the formation and duration of ice in all its form here in Svalbard.

Adult female leopard seal (Hydrurga leptonyx) hauled out on ice floe in Kayak Cove on Brabant Island near the Antarctic Peninsula, Southern Ocean