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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

The Parliament (Orszaghaz) across River Danube, UNESCO World Heritage Site, Budapest, Hungary, Europe

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

A large red deer stag (Cervus elaphus) stands his ground in foggy Richmond Park one winter morning, Richmond, Greater London, England, United Kingdom, Europe

A large red deer stag (Cervus elaphus) stands his ground in a misty Richmond Park one autumn morning, Richmond, Greater London, England, United Kingdom, Europe

A mandarin duck (Aix galericulata) glides through the water in a reflective and colourful pond in Richmond Park, Richmond, Greater London, England, United Kingdom, Europe

An Alaskan moose in winter roaming the Denali National Park, Alaska, United States of America, North America

American Crocodile (Crocodylus acutus), Tarcoles River, Carara National Park, Puntarenas Province, Costa Rica, Central America

Camel caravan along Wadi Saba canyon towards salt mines, Asso Bhole, Dallol, Danakil Depression, Afar Region, Ethiopia, Africa

Gray-headed Chachalaca (Ortalis cinereiceps), Boca Tapada, Alajuela Province, Costa Rica, Central America

American Crocodile (Crocodylus acutus), Tarcoles River, Carara National Park, Puntarenas Province, Costa Rica, Central America

Volcano Hummingbird (Selasphorus flammula), San Gerardo de Dota, San Jose Province, Costa Rica, Central America

Spectacled Caiman (Caiman Crocodilus), Tortuguero National Park, Limon Province, Costa Rica, Central America

Portrait of an immature rufescent tiger-heron (Tigrisoma lineatum), Mato Grosso, Brazil, South America

American Crocodile (Crocodylus acutus), Tarcoles River, Carara National Park, Puntarenas Province, Costa Rica, Central America

Brown-hooded Parrot (Pyrilia haematotis), Boca Tapada, Alajuela Province, Costa Rica, Central America

Spectacled Caiman (Caiman Crocodilus), Tortuguero National Park, Limon Province, Costa Rica, Central America

American Oystercatcher (Haematopus palliatus), Playa Arco Beach, Uvita, Marino Ballena National Park, Pacific Coast Costa Rica, Central America

Harbor seal (Phoca vitulina) face detail near Moss Landing, California, United States of America, North America

Northern Jacana (Jacana Spinosa), Tortuguero National Park, Limon Province, Costa Rica, Central America

View of the lake created by the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

A cattle pond (livestock tank), part frozen, Coconino National Forest, Apache Maid Mountain in the background, Arizona, United States of America

European hare (brown hare) (Lepus europaeus) standing on grassy farmland track in evening sunshine, Marlborough Downs, Wiltshire, England, United Kingdom, Europe

American red squirrel (red squirrel) (Spruce squirrel) (Tamiasciurus hudsonicus), Custer State Park, South Dakota, United States of America, North America

American red squirrel (red squirrel) (Spruce squirrel) (Tamiasciurus hudsonicus), Custer State Park, South Dakota, United States of America, North America

An adult nankeen night heron (Nycticorax caledonicus) on the banks of the Daintree River, Daintree rain forest, Queensland, Australia, Pacific

Bison (Bison bison) bull covered with frost in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Adult male Grant's gazelles (Nanger granti) sparring inside Ngorongoro Crater, UNESCO World Heritage Site, Tanzania, East Africa, Africa

An adult European roller (Coracias garrulus), Tarangire National Park, Tanzania, East Africa, Africa

A pack of banded mongooses (Mungos mungo), near their den site in Tarangire National Park, Tanzania, East Africa, Africa

African pipit (grassland pipit) (grassveld pipit) (Anthus cinnamomeus), Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Hooded vulture (Necrosyrtes monachus) in mixed juvenile and adult plumage with a prize from a wildebeest kill, Ngorongoro Conservation Area, UNESCO World Heritage Site, Serengeti, Tanzania, East Africa, Africa

Brown hyena (Hyaena brunnea) (formerly Parahyaena brunnea), Kgalagadi Transfrontier Park encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

Baby brown-throated sloth (Bradypus variegatus), San Francisco, Amazon Basin, Loreto, Peru, South America

A confusion of blue wildebeest (brindled gnu) (Connochaetes taurinus), on the Great Migration, Serengeti National Park, Tanzania, East Africa, Africa

A juvenile lilac-breasted roller (Coracias caudatus), Tarangire National Park, Tanzania, East Africa, Africa