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

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

Bison (Bison bison) cow in the winter, Yellowstone National Park, Wyoming, 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

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

Black bear (Ursus americanus), Yellowstone National Park, Wyoming, 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

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

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

Barn, Thomas Alma and Lucille Moulton Homestead, Mormon Row Historic District, Grand Teton National Park, Wyoming, United States of America, North America

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

Mesa Arch sunrise, Island in the Sky, Canyonlands National Park, Utah, United States of America, North America

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

Prairie smoke (purple aven) (old man's whiskers) (long-plumed avens) (Geum triflorum), Yellowstone National Park, Wyoming, 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

Last light on Half Dome, photographed from Olmsted Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Three black bear (Ursus americanus) cubs of the year, 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

Trees on a hillside covered with fog, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

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

Scotty's Castle, historic Spanish style castle in the north of the park, Death Valley National Park, California, United States of America (U.S.A.), North America

Sentinel Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Crested Pool, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, 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

Black Canyon of the Gunnison National Park, Gunnison River deep in the canyon, Colorado, United States of America, North America

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

American Robin (Turdus migratorius), 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

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

Bull elk (Cervus canadensis) feeding in the winter, Yellowstone 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

Sand dunes, 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

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

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

Small bush in the wash near a sandstone butte, Capitol Reef National Park, Utah, United States of America, North America

Lone Ponderosa pine atop a sandstone formation at first light, 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

Hickman Bridge Trail, Navajo Dome, Capitol Reef National Park, Utah, United States of America, North America

Grizzly bear (Ursus arctos horribilis) sow with two yearling cubs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Coyote (Canis latrans), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Slimpod shooting star (Dodecatheon conjugens), Yellowstone National Park, Wyoming, United States of America, North America

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

Cinnamon-colored black bear (Ursus americanus) walking, 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

Beaver (Castor canadensis) eating an evergreen branch, Yellowstone National Park, Wyoming, United States of America, North America

Bull elk (Cervus canadensis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fog among the mountains and evergreens, Yellowstone National Park, UNESCO World Heritage Site, 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

Duck Lake in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Two Grizzly Bear (Ursus arctos horribilis) cubs of the year or spring cubs playing, Yellowstone National Park, Wyoming, United States of America, North America

Tenaya Lake on the Tioga Pass in Yosemite National Park, UNESCO World Heritage Site, California, 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

The Margerie Glacier, whose face is retreating, in Glacier Bay National Park, Southeast Alaska, United States of America

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

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

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

Rocks covered with lichen, Deer Park, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America (U.S.A.), North America

Shores of the Virgin River and winter trees, Pa'rus Trail, Zion National Park, Utah, United States of America, North America

Sapphire Pool, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Cathedral Group of Mount Teewinot, Mount Owen and Grand Teton from the Snake River at Schwabacher's Landing, 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

A sandstone butte in Chaco Culture National Historical Park scenery, New Mexico, United States of America, North America

Pueblo Bonito Chaco Culture National Historical Park scenery, New Mexico, 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

Half Dome and Yosemite Valley from Glacier Point, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Bull elk (Cervus canadensis) at sunset in the winter, Yellowstone National Park, Wyoming, 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

Snake River at the Schwabacher Landing, Grand Teton National Park, Wyoming, United States of America, North America

View of Lower Falls from Red Rock Point, Grand Canyon of the Yellowstone River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Grizzly bear (Ursus arctos horribilis) sow with a yearling cub, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Male dusky grouse (blue grouse) (Dendragapus obscurus) displaying, Yellowstone National Park, Wyoming, United States of America, North America

Mount Grinnell and Swiftcurrent Lake at dawn, Glacier National Park, Montana, United States of America, North America

Gifford Farm House, Fruita, Capitol Reef National Park, Utah, United States of America, North America

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

Uinta ground squirrel (Urocitellus armatus), Yellowstone National Park, Wyoming, United States of America, North America

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

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

Hellen Lake with Mount Lassen, 3187 m, in the background, Lassen Volcanic National Park, California, United States of America, North America