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Early morning sunshine shines through spring trees, Yosemite Valley, California, United States of America, North America

Incline Railway on Lookout Mountain, Chattanooga, Tennessee, United States of America, North America

Rippled gypsum, sand dunes in the White Sands National Monument, New Mexico, United States of America, North America

Female tourist hiker and Sandstone Rock formations, Lower Antelope Canyon, Page, Arizona, United States of America, North America

West Mitten Butte, East Mitten Butte and Merrick Butte, The Mittens, Monument Valley Navajo Tribal Park, Arizona, United States of America, North America

Waterfall on Clear Creek, San Juan National Forest, Colorado, United States of America, North America

Fireweed (Chamerion angustifolium), San Juan National Forest, Colorado, United States of America, North America

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

Bison (Bison bison) cows grazing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Western kingbird (Tyrannus verticalis), Pawnee National Grassland, Colorado, United States of America, North America

Autumn trees flank the River Merced in Yosemite Valley, California, United States of America, North America

Morning Glory Pool in Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Gray wolf (Canis lupus), in captivity, Sandstone, Minnesota, United States of America, North America

Time exposure at night, Joshua Tree National Park, California, United States of America (U.S.A.), North America

Figure shows scale of the trunk of giant sequoia tree in the Giant Forest, Sequoia National Park, California, United States of America (U.S.A.), North America

Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

San Juan Islands seen from Chuckanut Drive, Puget Sound, Washington State, United States of America, North America

Snow geese (Anser caerulescens), Bosque del Apache, Socorro, New Mexico, United States of America, North America

Moss-covered tree trunks in the rainforest, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Bright colours and steam, Grand Prismatic Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Opossum (Didelphis virginiana) mother and babies, in captivity, Sandstone, Minnesota, United States of America, North America

Black bear (Ursus americanus) sow, Yellowstone National Park, Wyoming, United States of America, North America

Gray wolf (Canis lupus) mother and pup, in captivity, Bozeman, Montana, United States of America, North America

Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

A green sea turtle (Chelonia mydas) on Laniakea Beach, North Shore, Oahu, Hawaii, United States of America, Pacific

Half Dome mountain above the River Merced in springtime, Yosemite Valley, UNESCO World Heritage Site, California, United States of America, North America

Bull elk (Cervus canadensis) feeding in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Red Fox (Vulpes vulpes) (Vulpes fulva) in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Walnut Street pedestrian bridge over the Tennessee River, Chattanooga, Tennessee, United States of America, North America

Checkerboard Mesa, formed of Navajo sandstone, Zion National Park, Utah, United States of America, North America

American pika (Ochotona princeps), Peter Lougheed Provincial Park, Kananaskis Country, Alberta, Canada, North America

Star gentian (felwort) (Swertia perennis), San Juan National Forest, Colorado, United States of America, North America

Fog mingling with evergreen trees, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis) pushing over a dead tree, Glacier National Park, Montana, United States of America, North America

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

Common nighthawk (Chordeiles minor), Pawnee National Grassland, Colorado, United States of America, North America

Curious adult bull Steller sea lion (Eumetopias jubatus), Inian Islands, Southeast Alaska, United States of America, North America

Petroglyphs drawn in sandstone by Anasazi Indians around 500 AD, Valley of Fire State Park, Nevada, USA, North America

Top of the Lower Falls from Lookout Point at sunrise, Grand Canyon of the Yellowstone, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Horseback riding, Glacier International Peace Park, Montana, United States of America, North America

Man's feet in car at sunset in Key Byscaine, Miami, Florida, United States of America, North America

Mt. Rainier at dawn, autumn color in the lower valley, and White River in distance, Washington State, United States of America, North America

Silhouette of girl stretching at sunset, Puget Sound, with Blake Island in distance, Upper Queen Anne, Seattle, Washington. 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

The Mittens at dusk cast long shadows, Monument Valley Navajo Tribal Park, Utah and Arizona border, United States of America, North America

One of the Mittens at dusk casts a long shadow, Monument Valley Navajo Tribal Park, Utah and Arizona border, United States of America, North America

Striped skunk (Mephitis mephitis) baby on log with adult in log, in captivity, Sandstone, Minnesota, United States of America, North America

Trailer home with antenna on grassy lawn, Vashon Island, Washington State, United States of America, North America

Lava flowing from Kilauea Volcano, Hawaii Volcanoes National Park, UNESCO World Heritage Site, The Big Island, Hawaii, United States of America, North America

Sheep Meadow, Central Park on a Summer day, New York City, New York, United States of America, North America

Fort Union National Monument and Santa Fe National Historic Trail, New Mexico, United States of America, North America

Boulders and granite hills, Alabama Hills, Inyo National Forest, California, United States of America, North America

The Teton Range at dawn after a fresh snow, Grand Teton National Park, Wyoming, United States of America, North America

Bighorn sheep (Ovis canadensis) in the winter, Yellowstone National Park, Wyoming, United States of America, North America

Sandhill crane (Grus canadensis), Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

Three sandhill cranes (Grus canadensis) landing with pink clouds, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

American coot (Fulica americana) swimming, Bosque del Apache National Wildlife Refuge, New Mexico, United States of America, North America

View from Cadillac Mountain, Acadia National Park, Mount Desert Island, Maine, New England, United States of America, North America

Abyss Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

White-tailed ptarmigan (Lagopus leucurus) in summer plumage, San Juan National Forest, Colorado, United States of America, North America

American robin (Turdus migratorius), Glacier National Park, Montana, United States of America, North America

Western meadowlark (Sturnella neglecta) singing, Yellowstone National Park, Wyoming, United States of America, North America

Mountain goat (Oreamnos americanus) nanny resting, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

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

Unicorn Peak rising above a mist shrouded forest, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Granite mountains reflected in Tenaya Lake, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Emerald Spring in Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Adult bull Steller sea lions (Eumetopias jubatus), mock fighting, Inian Islands, Alaska, United States of America, North America

Humpback whale (Megaptera novaeangliae) breaching near the Glass Peninsula, southeast Alaska, United States of America, North America

Gray wolf (Canis lupus) running through water, in captivity, Minnesota Wildlife Connection, Sandstone, Minnesota, United States of America, North America

Steller's jay (Cyanocitta stelleri), Rocky Mountain National Park, Colorado, United States of America, North America

Griggs volcano overlooks Valley of Ten Thousand Smokes filled by ash in 1912 eruption of Katmai, Katmai Volcano National Park, Alaska, USA, North America

Visitors in the Giant Forest, Sequoia National Park, California, United States of America (U.S.A.), North America

River in winter, Refuge Point, West Yellowstone, Montana, United States of America (U.S.A.), North America

Birdwatcher on path, and red rock cliff towering above the Brins Mesa Trail. Sedona, Arizona, United States of America (U.S.A.), North America