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

Adult brown bears (Ursus arctos) disputing fishing rights for salmon in 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 white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

Adult white-beaked dolphin (Lagenorhynchus albirostris) surfacing in the Svalbard Archipelago, Norway

A curious young polar bear (Ursus maritimus), approaches the ship on Spitsbergen in the Svalbard Archipelago, Norway

Dogs by river, Ksar of Ait-Ben-Haddou, UNESCO, seen from opposite bank, Ounila River valley, Ouarzazate Province, Draa-Tafilalet region, Morocco

Great blue heron (Ardea herodias), standing alert beside trail in Shark Valley, Everglades National Park, Florida, United States of America, North America

Starling murmuration at sunset next to the Brighton Palace Pier, City of Brighton and Hove, East Sussex, England, United Kingdom

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

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

An adult wild saltwater crocodile (Crocodylus porosus) in the Hunter River in Mitchell River National Park, Kimberley, Western Australia, Australia, Pacific

Gentoo penguins (Pygoscelis Papua) afloat on an iceberg in the Antarctic peninsula, Antarctica, Polar Regions

Hippopotamus (Hippopotamus amphibius) mother and baby out of the water, Serengeti National Park, Tanzania, East Africa, Africa

Narrowboats on the Kennet and Avon Canal by Northcroft Park on a frosty winter morning, Newbury, Berkshire, England, United Kingdom, Europe

Sandscale Haws National Nature Reserve, starlings at sunset towards the Irish Sea and the distant Walney Offshore Wind Farm, Cumbria, England, United Kingdom, Europe

Great Egret (Ardea alba) on left and little egret (Egretta garzetta) at Nosara Beach and river mouth, Nosara, Guanacaste, Costa Rica, Central America

Transient killer whale (Orcinus orca) breaching in the Monterey Bay National Marine Sanctuary, California, United States of America, North America

An adult American red squirrel (Tamiasciurus hudsonicus), Leigh Lake, Grand Teton National Park, Wyoming, United States of America, North America

An adult sea otter (Enhydra lutris) resting on its back in the harbor at Kodiak, Kodiak Island, Alaska, United States of America, North America

An adult sea otter (Enhydra lutris) resting on its back in the harbor at Kodiak, Kodiak Island, Alaska, United States of America, North America

Warthog (Phacochoerus africanus) drinking, with redbilled oxpeckers, Zimanga game reserve, KwaZulu-Natal, South Africa, Africa

Golden sands, palm trees and ubiquitous house crows on popular Marari Beach, Mararikulam, Alappuzha (Alleppey), Kerala, India, Asia

California gray whale (Eschrichtius robustus), with whale watchers, San Ignacio Lagoon, Baja California Sur, Mexico, North America

Days catch of sardines being sorted at a fish processing plant in Puerto San Carlos, Baja California Sur, Mexico, North America

Young whale shark (Rhincodon typus), filter feeding near the surface at El Mogote, Baja California Sur, Mexico, North America

Adult Atlantic walrus (Odobenus rosmarus), on the beach in Musk Ox Fjord, Ellesmere Island, Nunavut, Canada, North America

Crowds of Guillemots (Uria aalge), on Staple Island, in the Farne Islands, Northumberland, northeast England, United Kingdom, Europe

Group of Great white egrets (Ardea alba) looking for food in a pond, Sanibel Island, J.N. Ding Darling National Wildlife Refuge, Florida, United States of America, North America

Ecotype Big B killer whale (Orcinus orca), surfacing amongst ice floes in Lemaire Channel, Antarctica, Polar Regions

Adult Galapagos marine iguanas (Amblyrhynchus cristatus), on Fernandina Island, Galapagos, Ecuador, South America

Polar bear (Ursus maritimus), mother and two cubs on an ice floe in the fog in Davis Strait, Nunavut, Canada, North America

Penguins marching along a glacier face on Saunders Island, South Sandwich Islands, South Atlantic, Polar Regions

Hippos enjoying the water seen on a Safari in the Maasai Mara National Reserve, Kenya, East Africa, Africa

A pair of humpback whales (Megaptera novaeangliae), underwater on the Silver Bank, Dominican Republic, Greater Antilles, Caribbean, Central America

Black-browed albatross (Thalassarche melanophris), chicks at breeding colony on Saunders Island, Falklands, South America

Humpback whale (Megaptera novaeangliae), mother and calf underwater, Ningaloo Reef, Western Australia, Australia, Pacific

A pod of transient killer whales (Orcinus orca), catching and killing an elephant seal in Monterey Bay Marine Sanctuary, California, United States of America, North America

A pair of American flamingo (Phoenicopterus ruber) feeding on artesmia shrimp, Rabida Island, Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Killer whale pod (Orcinus orca), off Punta Colorada, Isla San Jose, Baja California Sur, Mexico, North America

Rocky mountain bighorn rams headbutting (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Rocky mountain bighorn rams (ovis canadensis) during the rut (mating) season, Jasper National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North 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