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Adult brown bears (Ursus arctos) and wolf (Canis lupus) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) exhibiting courtship behavior at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on salmon at Iyoukeen Cove on Chichagof Island, Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) feeding on humpback whale carcass in Glacier Bay National Park, Alaska, United States of America

Adult brown bear pair (Ursus arctos) mock-fighting at Scidmore Cut in Glacier Bay National Park, Alaska, United States of America

Adult brown bear (Ursus arctos) shaking water from its fur near whale carcass in Glacier Bay National Park, Alaska, United States of America

A small pod of killer whales (Orcinus orca) encountered in Glacier Bay National Park, 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

Harbor seals (Phoca vitulina) hauled out on submerged log in Misty Fjords National Monument, 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

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) leaping in Johnstone Strait, British Columbia, Canada

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) leaping in Johnstone Strait, British Columbia, Canada

A pod of Pacific white-sided dolphins (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

An adult Pacific white-sided dolphin (Lagenorhynchus obliquidens) bow-riding in Johnstone Strait, British Columbia, Canada

A small pod of killer whales (Orcinus orca) encountered off West Craycroft Island in Blackfish Sound, British Columbia, Canada

Adult Arctic ground squirrel (Spermophilus parryii) foraging in Denali 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

View from Park Service platform where adult brown bears (Ursus arctos) forage for salmon, 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

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) 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

Young brown bear (Ursus arctos) standing looking for salmon, Brooks River, Katmai National Park, Alaska, United States of America

Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

Adult bearded seal (Erignathus barbatus) swimming amongst the ice in the Svalbard Archipelago, Norway

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

Adult arctic tern (Sterna paradisaea) male bringing female a fish, Spitsbergen Island in the Svalbard Archipelago, Norway

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

A young polar bear (Ursus maritimus) scavenging a fresh bearded seal kill recently vacated by old male that killed the seal, Svalbard, Norway

A young polar bear (Ursus maritimus) scavenging a fresh bearded seal kill recently vacated by old male that killed the seal, Svalbard, Norway

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

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

Adult polar bear (Ursus maritimus) in Holmabukta on the northwest coast of Spitsberge, Svalbard Archipelago, Norway

Mother polar bear (Ursus maritimus), with cub of the year in Holmabukta in the Svalbard Archipelago, Norway

Adult male polar bear (Ursus maritimus) drawn to a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

Two mother polar bears (Ursus maritimus) with cubs of the year watch a male bear feeding on a fin whale carcass in Svalbard, Norway

Two mother polar bears (Ursus maritimus) with cubs of the year watch a male bear feeding on a fin whale carcass in Svalbard, Norway

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

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

Young male polar bear (Ursus maritimus), feeding on a fin whale carcass in Holmabukta in the Svalbard Archipelago, Norway

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

Adult Atlantin puffin (Fratercula arctica) during breeding season, Isfjardardjup, Westfjords region, Northwestern Iceland

Adult Atlantin puffin (Fratercula arctica) during breeding season, Isfjardardjup, Westfjords region, Northwestern Iceland

Adult Atlantin puffin (Fratercula arctica) during breeding season on Sumburgh Head, Shetlands, Scotland, United Kingdom

Northern gannet (Morus bassanas) breeding colony at the cliffs of Noss, Shetland Islands, Scotland, United Kingdom

Adult black guillemot (Cepphus grylle) in summer plumage near Vigur Island in Isafjardardjup Bay, Iceland

Adult male hooded seal (Cystophora cristata) hauled out on pack-ice in seasof Denmark Strait, between Iceland and Greenland

Adult harlequin duck (Histrionicus histrionicus) in full breeding plumage in the calm waters of Lake Myvatn, Iceland

Group of at least eight killer whales (Orcinus orca) surfacing off the coast of the island of Surtsey, southern Iceland

Harp seal (Pagophilus groenlandicus), hauled out on the pack-ice in between Iceland and Greenland in the Denmark Strait, Denmark

American Bison in their natural habitat of the Badlands, South Dakota, United States of America, North America

Eurasian Badger (Meles meles) adult, pair standing beside each other, coppice woodland habitat, Kent, England, United Kingdom, Europe

Southern viscacha (Lagidium viscacia), a rabbit-like rodent found in mountainous habitat, Salar de Uyuni, Bolivia, South America

Two imposing alligators lounging on the leaf-strewn bank of a river, surrounded by thick greenery, in a natural habitat in Recreio dos Bandeirantes, Rio de Janeiro, Brazil, South America

An imposing alligator is captured lounging on the leaf-strewn bank of a river, surrounded by thick greenery, in a natural habitat in Recreio dos Bandeirantes, Rio de Janeiro, Brazil, South America

A broadclub cuttlefish (Sepia latimanus) lays eggs in a coral colony in Komodo National Park, Indonesia.

A slightly bleached staghorn coral colony grows in shallow water in the Solomon Islands. This Melanesian region is known for its spectacular marine biodiversity.

Soft leather corals grow in the shallow waters in the Solomon Islands, Melanesia. This region, in the eastern part of the Coral Triangle, harbors spectacular marine biodiversity and is known for its beautiful reefs.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

A hawksbill sea turtle swims over a coral reef in Palau. This is an endangered species often hunted for its shell and meat.

False clownfish (Amphiprion ocellaris) swim near their host anemone in Alor, Indonesia. This remote region is known for its beautiful reefs and spectacular marine biodiversity.

A Clark's anemonefish (Amphiprion clarkii) snuggles amongst its host's tentacles on a reef in Lembeh Strait, Indonesia.

A beautiful nudibranch (Hypselodoris bullockii) crawls slowly across a reef in Indonesia. This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

A beautiful set of tiny tunicates grows on a reef in Indonesia.This tropical region, within the Coral Triangle, is home to an incredible variety of marine life.

Coral polyps (Galaxea sp.) wait for plankton on a reef in Komodo National Park, Indonesia. This beautiful area harbors extraordinary marine biodiversity and is a popular destination for divers and snorkelers.