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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) disputing fishing rights 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

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) 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

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

Young brown bear (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 in the Brooks River, Katmai National Park, Alaska, United States of America

Alaskan brown bears (Ursus arctos) sow and cubs foraging 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

Young brown bear (Ursus arctos) cubs watching mom hunt for salmon in 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

Lodore Waterfalls, Borrowdale Valley, Lake District National Park, UNESCO, Cumbria, England, United Kingdom

Lodore Falls waterfalls, Borrowdale Valley, Lake District National Park, UNESCO, Cumbria, England, United Kingdom

Adult buck Timor rusa deer (Cervus timorensis), Komodo National Park, Komodo Island, Indonesia, Southeast Asia, Asia

Moai heads of Easter Island, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America

Moai heads of Easter Island, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America

Aerial of the Song Con River with the limestone mountains in the background, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

View from below the historic Bainbridge Steel Dam near Ash Fork, Kaibab National Forest, Arizona, United States of America

Interior of an abandoned homestead in the Coconino National Forest, Arizona, United States of America

A cattle pond (livestock tank), partially frozen, Coconino 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

Houseboats moored in Wahweap Bay, Castle Rock beyond, Lake Powell, Glen Canyon National Recreation Area, Page, Arizona, United States of America, North America

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

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park, UNESCO, in winter, Western Region, Iceland

Continental drift between North American and Eurasian tectonic plates, Thingvellir National Park in winter, UNESCO, Western Region, Iceland

Colourful Paradise cave, Phong Nha-Ke Bang National Park, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Basalt boulders and cliffs, Johnson Canyon east of Bainbridge Steel Dam Lake near Ash Fork, Kaibab National Forest, Arizona, United States of America

Basalt boulders and cliffs, Johnson Canyon east of Bainbridge Steel Dam Lake near Ash Fork, Kaibab National Forest, Arizona, United States of America

Basalt boulders and cliffs in a section of Johnson Canyon halfway between the Bainbridge Steel Dam and Stone Dam near Ash Fork Arizona in the Kaibab National Forest.

Basalt boulders and cliffs in a section of Johnson Canyon halfway between the Bainbridge Steel Dam and Stone Dam near Ash Fork Arizona in the Kaibab National Forest.

Lake Sandoval and Aguaje palms, Tambopata National Reserve, Puerto Maldonado, Madre de Dios, Peru, South America

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

A school of razorfish (Aeoliscus strigatus), head down posture at night on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

Hard and soft corals and sea star underwater on Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

A school of razorfish (Aeoliscus strigatus), head down posture on the house reef at Sebayur Island, Komodo Island National Park, Indonesia, Southeast Asia, Asia

MacDonalds Big Pond, Cape Breton Highlands National Park, Cape Breton Island, Nova Scotia, Canada, North America

Glenveagh castle in the Glenveagh National Park, County Donegal, Ulster, Republic of Ireland, Europe

Common ostrich (Struthio camelus) chick, Kgalagadi Transfrontier Park, encompassing the former Kalahari Gemsbok National Park, South Africa, Africa

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

Graves on the cliffs at Beachy Head, South Downs National Park, East Sussex, England, United Kingdom, Europe

Mountain biking along the chalk cliffs coastal path on the South Downs Way near Beachy Head, South Downs National Park, East Sussex, England, United Kingdom, Europe

Adult tomato clownfish (Amphiprion frenatus), Mengiatan Island, Komodo National Park, Flores Sea, Indonesia, Southeast Asia, Asia

Petroglyphs in Papa Vaka, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America

Moais at the quarry on the slope of the Rano Raraku Volcano, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America

View over the Teide volcano and Teide National Park, UNESCO World Heritage Site, Tenerife, Canary Islands, Spain, Europe

Close up of a wild Rocky Mountain Bighorn Sheep (Ovis canadensis), Jasper National Park, Canada, North America

East African oryx (Oryx beisa) passing by a cattle herd illegally grazing in the Tsavo West National Park, Kenya, East Africa, Africa

Wrangell-St. Elias National Park landscape from the Willow Lake, UNESCO World Heritage Site, Alaska, United States of America, North America

Mount St. Helens with wild flowers, Mount St. Helens National Volcanic Monument, Washington State, United States of America, North America

Reflection Lake, Mount Rainier National Park, Washington State, United States of America, North America

Rudyerd Bay ripples, beautiful summer day, Misty Fjords National Monument, Tongass National Forest, Alaska, United States of America, North America

View from Mam Tor of fog in Hope Valley at sunrise, Castleton, Peak District National Park, Derbyshire, England, United Kingdom, Europe

A male lion wooing a female (Panthera leo) before mating in Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Family of African elephant (Loxodonta africana), Serengeti National Park, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Northern Lights (Aurora Borealis) above the snowy woods, Pallas-Yllastunturi National Park, Muonio, Lapland, Finland, Europe

Piedras Blancas Glacier, Los Glaciares National Park, UNESCO World Heritage Site, Santa Cruz Province, Patagonia, Argentina, South America

Barmouth Bridge at sunrise, Snowdonia National Park, Gwynedd, North Wales, Wales, United Kingdom, Europe

Rainbow Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tent at Camp 4 at 6100m on Peak Korzhenevskaya, 7105m, at sunset, Tajik National Park (Mountains of the Pamirs), UNESCO World Heritage Site, Tajikistan, Central Asia, Asia

Stock Ghyll Force Waterfalls, Ambleside, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, Europe

El Cabo San Juan del Guia beach, elevated view, Tayrona National Natural Park, Magdalena Department, Caribbean, Colombia, South America

Southern double collared sunbird, Cinnyris chalybeus, feeding, Kirstenbosch National Botanical Garden, Cape Town, South Africa

Aerial of the Lower Kolsai Lake, Kolsay Lakes National Park, Tian Shan mountains, Kazakhstan, Central Asia, Asia

Moai heads of Easter Island, Rapa Nui National Park, UNESCO World Heritage Site, Easter Island, Chile, South America