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Eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Teton Range, footbridge and pines with reflections, Bradley Lake, Grand Teton National Park, Wyoming, United States of America, North America

Red Fox (Vulpes vulpes) (Vulpes fulva), Yellowstone National Park, Wyoming, United States of America, North America

Male Yellow-Headed Blackbird (Xanthocephalus xanthocephalus), Yellowstone National Park, Wyoming, United States of America, North America

River otter (Lutra canadensis) mother and two pups, Yellowstone National Park, Wyoming, United States of America, North America

Bison (Bison bison) bull in the winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Sandstone swirl under clouds, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Sandstone formation at dawn, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Hiker on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Salmon-coloured sandstone wall with evergreens, Grand Staircase-Escalante National Monument, Utah, United States of America, North America

Petroglyph National Monument, petroglyphs carved into volcanic rock by American Indians 400 to 700 years ago, New Mexico, United States of America, North America

Silver Lake in the fall, Wasatch-Cache National Forest, Utah, United States of America, North America

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

The Spectacles (North and South Windows), Arches National Park, Moab, Utah, United States of America, North America

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

Mother brown bear and her cub, Sequoia National Park, California, United States of America, North America

Puebloans mud and stone granaries, Aztex Butte, Canyonlands National Park, Utah, United States of America, North America

Bison (Bison bison) cows sparring, Yellowstone National Park, Wyoming, United States of America, North America

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

Yellow warbler (Dendroica petechia), female, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Lazuli bunting (Passerina amoena), male in winter plumage, Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

Dusky-capped flycatcher (Myiarchus tuberculifer), Chiricahuas, Coronado National Forest, Arizona, United States of America, North America

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

Waves of Brain Rock, White Pocket, Vermilion Cliffs National Monument, Arizona, United States of America, North America

Yosemite Falls beyond a flooded meadow in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Fresh snow on evergreens, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View from Yavapai Point, in evening light, Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America (U.S.A.), North America

Christine Falls, Mount Rainier National Park, Washington state, United States of America, North America

Moose (Alces alces) cow in pond breaks from filter feeding and stares at camera, Grand Teton National Park, Wyoming, United States of America, North America

Yellowstone River in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Slump Block area in Theodore Roosevelt National Park North Unit, Watford, North Dakota, United States of America, North America

Bison (Bison bison) calf, Yellowstone National Park, Wyoming, United States of America, North America

Mountain Bluebird (Sialia currucoides) male, Yellowstone National Park, Wyoming, United States of America, North America

Male Red-Winged Blackbird (Agelaius phoeniceus), Yellowstone National Park, Wyoming, United States of America, North America

Pueblo Bonito Chaco Culture National Historical Park scenery, New Mexico, United States of America, North America

Black Bear (Ursus americanus) sow climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America

Sandstone formations under clouds, Coyote Buttes Wilderness, Vermillion Cliffs National Monument, Arizona, United States of America, North America

Sand dunes in the Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Grizzly bear (Ursus arctos horribilis) sow and three cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America

Tenaya Lake on the Tioga Pass, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Red leaves on a big tooth maple (Acer grandidentatum) near a Ponderosa pine (Pinus ponderosa) trunk in the fall, Zion National Park, Utah, United States of America, North America

The enormous face of El Capitan towering above Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Majestic view of Yosemite Valley from Tunnel View, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Spider Rock from Spider Rock Overlook, Canyon de Chelly National Monument, Arizona, United States of America, North America

Sunset at Locust Point, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Panoramic photo of Court of the Patriarchs, Abraham Peak, Isaac Peak, Mount Moroni and Jacob Peak, Zion National Park, Utah, United States of America, North America

Fremont Indian petroglyphs in Capitol Reef National Park, Utah, United States of America, North America

Thor's Hammer in early morning from Sunset Point, Bryce Canyon National Park, Utah, United States of America, North America

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

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

Butter-and-eggs (common toadflax) (yellow toadflax) (Linaria vulgaris), San Juan National Forest, Colorado, United States of America, North America

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

Roseroot (king's crown) (Sedum rosea), Gunnison National Forest, Colorado, United States of America, North America

Tourists at Mather Point, early morning, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Bison (Bison bison) bull, Yellowstone National Park, Wyoming, United States of America, North America

Male Williamson's sapsucker (Sphyrapicus thyroideus) poking out of its nest hole, Yellowstone National Park, Wyoming, United States of America, North America

El Capitan reflected in the Merced River in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

The Three Brothers reflected in the Merced River in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

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

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

Elk (Cervus canadensis) calf nursing, Yellowstone National Park, Wyoming, United States of America, North America

Half Dome from the Merced River, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Bridalveil Fall in spring Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Sunset through Cyclops' Skull Arch, Alabama Hills, Inyo National Forest, California, United States of America, North America

The Narrows of the Virgin River in the fall, Zion National Park, Utah, United States of America, North America

Unicorn Peak reflected in Tuolumne Grove seasonal ponds, 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

Elk (Cervus canadensis) near Lake Village, Yellowstone National Park, Wyoming, United States of America, North America

Firehole Spring, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Snow-covered mountain in the winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Shane Cabin, Homestead, near Kelly, Grand Teton National Park, Wyoming, United States of America, North America

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

Sol Duc Falls, Olympic National Park, UNESCO World Heritage Site, Washington state, United States of America, North America

Sunset lights The Watchman, Virgin River overlook in winter, Zion National Park, Utah, United States of America, North America

Low tide, Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America

Low tide, Cabrillo National Monument, Point Loma, San Diego, California, United States of America, North America

Grand Geyser erupts and steam blocks the sun, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

Water, trees, and mountains viewed from the waters of Lake Quinault, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Bull moose (Alces alces), Roosevelt National Forest, Colorado, United States of America, North America

El Capitan and Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Two Bison (Bison bison) bulls sparring, Yellowstone National Park, Wyoming, United States of America, North America

Female Mountain Bluebird (Sialia currucoides) with food at the nest, Yellowstone National Park, Wyoming, United States of America, North America

Woman watching sunset, Joshua Tree National Park, California, United States of America, North America

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

Hikers on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America