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Two black-tailed prairie dog (blacktail prairie dog) (Cynomys ludovicianus) with one calling, Custer State Park, South Dakota, United States of America, North America

Male mountain bluebird (Sialia currucoides), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Mount Ruapehu, Tongariro National Park, UNESCO World Heritage Site, North Island, New Zealand, Pacific

Dead tree and view of canyon from the South Rim at Hopi Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

Hoodoos, on the Queens Garden Trail, Bryce Canyon National Park, Utah, United States of America, North America

Bison (Bison bison) bulls sparring, Custer State Park, South Dakota, United States of America, North America

Last light on Half Dome above Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Fog among evergreens, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Pueblo Mission in background), Kiva in foreground, Pecos National Historic Park, New Mexico, United States of America, North America

High Sierra mountain scenery from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Seasonal ponds on Tuolumne Meadows in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Elk, Cervus canadensis, wapiti, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Pronghorn (Antilocapra americana) buck, Yellowstone National Park, Wyoming, United States of America, North America

Clouds reflected in a pond, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Badlands layers on a hazy morning, Badlands National Park, South Dakota, United States of America, North America

Mist shrouded Pyramid Lake at dawn in the Canadian Rockies, Jasper National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Dinorwic (Dinorwig) Power Station and Dinorwic Quarry across Llyn Peris, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

Grizzly Bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America

Colourful sunset skies above the snow dusted mountains of Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Walker looking out over Mount Snowdon (Yr Wyddfa), Y Lliwedd and Llyn Llydaw in winter, Snowdon Horseshoe, Cwm Dyli, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

Quarry levels and inclines at sunset, Dinorwic (Dinorwig) Quarry, Eryri, Snowdonia National Park, North Wales, United Kingdom, Europe

Tourists onboard airboat in the Everglades Safari Park, Miami, Florida, United States of America, North America

Yosemite Falls reflected in a flooded Cooks Meadow, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Pink clouds over snow-covered hills at sunset, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Hikers, Miners Track, one of the paths to summit of Mount Snowdon, Snowdonia National Park, North Wales, Wales, United Kingdom, Europe

Traffic on Trans Canada Highway 1, Canadian Rockies, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

View of Merced River and Upper Yosemite Falls, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Lamplugh Glacier in Glacier Bay National Park, southeast Alaska, United States of America, North America

Takkakaw Falls, Yoho National Park, UNESCO World Heritage Site, Rocky Mountains, British Columbia (B.C.), Canada, North America

Windstone Arch (The Fire Cave), Valley of Fire State Park, Nevada, United States of America, North America

Teton Mountains seen from Schwabacher's Landing, Grand Teton National Park, Wyoming, United States of America (U.S.A.), North America

Castle Mountain with Bow River in winter, Banff National Park, UNESCO World Heritage Site, Alberta, Canada, North America

Sandstone formations in the Cathedral Gorge State Park, Nevada, United States of America, North America

Reflection of the Teton range, Bradley Lake, Grand Teton National Park, Wyoming, United States of America, North America

Regenerating trees reflected in a frosty and misty Lewis River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Bow Summit, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Num-Ti-Jah Lodge, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Lake Louise, Banff National Park, UNESCO World Heritage Site, Rocky Mountains, Alberta, Canada, North America

Grizzly bear (Ursus horribilis), Glacier National Park, Montana, United States of America, North America

Spokane River in major flood, Riverfront Park, Spokane, Washington State, United States of America, North America

Belvedere Castle and Turtle Pond, Central Park, Manhattan, New York City, New York, United States of America, North America

Line of Bison (Bison bison) crossing the Lamar River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Saguaro cacti, Saguaro National Park, Tuscon Mountain District west unit, Tucson, Arizona, United States of America, North America

Sunrise over sandstone formations, Valley Of Fire State Park, Nevada, United States of America, North America

Boats at low tide, cliffs, steep cove of coastal fishing village in summer, Staithes, North Yorkshire Moors National Park, Yorkshire, England, United Kingdom, Europe

Bull Moose (Alces alces) with snow on its antlers, Grand Teton National Park, Wyoming, United States of America, North America

Willow Ptarmigan (Lagopus lagopus), Katmai National Park and Preserve, Alaska, United States of America, North America

Coyote (Canis latrans) in snow, Yellowstone National Park, Wyoming, United States of America, North America

Five Faces Pictograph, Anthropomorph images 700 to 1000 years old, Davis Canyon, Canyonlands National Park, Utah, United States of America, North America

Strange rock formations in the Roosevelt National Park, North Dakota, United States of America, North America

The northern part of the Roosevelt National Park, North Dakota, United States of America, North America

Tourist on a jungle trek in Gunung Leuser National Park, Bukit Lawang, North Sumatra, Indonesia, Southeast Asia, Asia

Johns Hopkins Inlet, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Valley of the Moon (Valle de la Luna), rock formation known as the Submarine, Ischigualasto Provincial Park, San Juan Province, North Argentina, South America

Perito Moreno Glaciar north face, Los Glaciares National Park, UNESCO World Heritage Site, near El Calafate, Patagonia, Argentina, South America

Glasseye (Heteropriacanthus cruentatus) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Bluespine unicorn fish (Naso unicornis) close-up, Ras Mohammed National Park, off Sharm el-Sheikh, Sinai, Red Sea, Egypt, North Africa, Africa

Hiking in Naikoon Provincial Park, Haida Gwaii (Queen Charlotte Islands), British Columbia, Canada, North America

Salt flats near Badwater Basin, Death Valley National Park, California, United States of America, North America

Chaco Culture National Historic Park, World Heritage Site, Casa Rinconada, UNESCO World Heritage Site, New Mexico, United States of America, North America

Pronghorn (Antilocapra americana) buck, Custer State Park, South Dakota, United States of America, North America

Pit House, Step House Ruin, dates from 626AD to 1226AD, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Polar bear (Ursus maritimus) and cubs, Wapusk National Park, Churchill, Hudson Bay, Manitoba, Canada, North America

Grizzly bear (Ursus arctos horribilis) (Coastal brown bear) dripping wet while fishing, Katmai National Park and Preserve, Alaska, United States of America, North America

Pine tree growing on a sandstone ledge, Zion National Park, Utah, United States of America, North America

Great Sand Dunes and mountains with snow, Great Sand Dunes National Park and Preserve, Colorado, United States of America, North America

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

El Capitan, a 3000 feet granite monolith, with the Merced River flowing through Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America