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Early Morning Sunrise, West Mitten Butte, Monument Valley Navajo Tribal Park, Utah, United States of America

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

Adult mountain goat (Oreamnos americanus) on cliff face in Tracy Arm, Southeast Alaska, United States of America

Dead and dying pink salmon (Oncorhynchus gorbuscha) gathering after the spawn just outside of Sitka, Alaska, United States of America

Scenic view from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America

Scenic view from Tracy Arm-Fords Terror Wilderness area in Southeast Alaska, United States of America

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

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 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

A large stand of Arctic cotton (Eriophorum callitrix) in Denali National Park, Alaska, United States of America

A large stand of Arctic cotton (Eriophorum callitrix) in Denali National Park, Alaska, United States of America

Riding the bus along the 92 mile-long road into Denali National Park, Alaska, United States of America

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

View of the Polychrome Mountains from lookout point on the park road inside Denali National Park and Preserve, Alaska, United States of America

Adult Arctic ground squirrel (Spermophilus parryii) foraging in Denali National Park, Alaska, United States of America

View of swans and ducks with City Hall in background in the city centre of Reykjavik at dusk in winter, Reykjavik, Iceland

View of wildlife on Tjornin lake and Lutheran Free Church on a sunny day in winter, Reykjavik, Iceland

Wild horses grazing in front of Sor Tuzbair, a solonchak (salt marsh), Mangystau, Kazakhstan, Central Asia, Asia

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

Hottentot fig (Carpobrotus edulis) flower, South African succulent plant now found in Europe, Australia and the Americas, Bermuda

Fiery-throated Hummingbird (Panterpe insignis), San Gerardo de Dota, San Jose Province, Costa Rica, Central America

A view of Isfjorden (Ice fjord) on the western side of Spitsbergen Island in the Svalbard Archipelago, Norway

A view of Isfjorden (Ice fjord) on the western side of Spitsbergen Island in the Svalbard Archipelago, Norway

Water melting from the Briksdalsbreen glacier south of the small town of Olden in coastal Norway, Vestland, 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

A beautiful waterfall just outside the small Norwegian summer area in Sandvika Bay on the south side of Svesfjord, Norway

Roseate Spoonbill (Platalea ajaja), Tarcoles River, Carara National Park, Puntarenas Province, Costa Rica, Central America

Fiery-throated Hummingbird (Panterpe insignis), San Gerardo de Dota, San Jose Province, Costa Rica, Central America

Magnificent Hummingbird (Eugenes fulgens) (Refulgent Hummingbird), San Gerardo de Dota, San Jose Province, Costa Rica, Central America

American White Ibis (Eudocimus albus), Tarcoles River, Carara National Park, Puntarenas Province, Costa Rica, Central America

Adult crabeater seals (Lobodon carcinophaga), from the National Geographic Explorer in the Lemaire Channel, Antarctica, Polar Regions

Type Big B killer whales (Orcinus orca), searching ice floes for pinnipeds in the Weddell Sea, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua), leaping off ice in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua), underwater in clear water in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions

Gentoo penguins (Pygoscelis papua), underwater in clear water in Lindblad Cove, Trinity Peninsula, Antarctica, Polar Regions