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Bison (Bison bison), Theodore Roosevelt National Park, North Dakota, United States of America, 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
Eruption of Riverside Geyser seen from Firehole River bridge, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Erupting geyser and Old Faithful Inn, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Peekaboo Loop Trail sign with snow and rocks lit by early morning winter sun, Bryce Canyon National Park, Utah, United States of America, North America
Rainbow cast by eruption of Riverside Geyser, Firehole River, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Sawmill Geyser erupts, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
View down Zion Canyon from trail to Angels Landing at dawn, Zion National Park, Utah, United States of America, North America
A stone brick museum is dwarfed by giant sequoia trees at Mariposa Grove after fresh snowfall, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Sunset at Crater Lake with Wizard Island, Crater Lake National Park, Oregon, United States of America, North America
Desert Varnish on rocks, The Gorge, Capitol Reef National Park, Utah, United States of America, North America
Black Bear (Ursus americanus) cub of the year climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America
Coyote (Canis latrans), Yellowstone National Park, Wyoming, United States of America, North America
Female Barrow's Goldeneye (Bucephala islandica), Yellowstone National Park, Wyoming, United States of America, North America
Landscape, Mount Rainier National Park, Washington State, United States of America, North America
Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, Wyoming, United States of America, North America
Great gray owl (great grey owl) (Strix nebulosa) chicks, one 25 and one between 22 and 24 days old, Yellowstone National Park, Wyoming, United States of America, North America
Three bare trees on a hazy morning, Badlands National Park, South Dakota, United States of America, North America
Hikers descend the curving South Kaibab trail in Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, United States of America, North America
Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America
Female mountain bluebird (Sialia currucoides) with an insect, Yellowstone National Park, Wyoming, 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
Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grizzly bear (Ursus arctos horribilis) sow and yearling cub, Glacier National Park, Montana, United States of America, North America
Grizzly bear (Ursus arctos horribilis) in the rain, Glacier National Park, Montana, United States of America, North America
River Otter (Lutra canadensis) on frozen Yellowstone Lake, Yellowstone National Park, Wyoming, United States of America, North America
Barrow's Goldeneye (Bucephala islandica) swimming, Yellowstone National Park, Wyoming, United States of America, North America
Male Williamson's sapsucker (Sphyrapicus thyroideus) at its nest hole, Yellowstone National Park, Wyoming, 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
Photographer at Tenaya Lake in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Giant Sequoia (Sequoiadendron giganteum) in a sunlit woodland, Mariposa Grove, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Dead evergreen tree and sandstone mounds, Zion National Park, Utah, United States of America, North America
Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Two Black Bear (Ursus americanus) cubs of the year or spring cubs playing, Yellowstone National Park, Wyoming, United States of America, North America
Flooded meadow in Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
River Tuolumne adjacent to Yosemite National Park, California, United States of America, North America
Detail of a totem pole on display at Sitka National Historical Park in Sitka, Baranof Island, Southeast Alaska, United States of 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
Landscape, Mount Rainier National Park, Washington state, United States of America, North America
Colorado River, Canyonlands National Park, Utah, United States of America, North America
Bryce Canyon National Park, Utah, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Female tourist on boardwalk by the Morning Glory Pool, Upper Geyser Basin, 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
Male Mountain Bluebird (Sialia currucoides) with food at the nest, Yellowstone National Park, Wyoming, 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
Black bear (Ursus americanus) sow and two yearling cubs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Black bear (Ursus americanus) cub of the year or spring cub in a tree, Yellowstone National Park, Wyoming, United States of America, North America
Bryce Canyon, Bryce Canyon National Park, Utah, United States of America, North America
Scree field on the side of a sandstone butte, Capitol Reef National Park, Utah, United States of America, North America
Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America
Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America
Black bear (Ursus americanus) cub of the year or spring cub climbing a tree, Yellowstone National Park, Wyoming, United States of America, North America
Box elder (boxelder maple) (maple ash) (Acer negundo) branch with yellow leaves in the fall, Capitol Reef National Park, Utah, 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
Two girls with parasols in Burnt Forest, Yellowstone National Park, Wyoming, United States of America, North America
Vintage tour bus on the Sun Road, Glacier National Park, Montana, United States of America, North America
Watch Tower, Colorado River below, Desert View Point, 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
Lake Helen and Mount Lassen, 3187 meters, in the background, Lassen Volcanic National Park, California, United States of America, North America
Half Dome at sunset, the mountain partially obscurred by smoke from the 2014 Dog Rock wildfire, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America
Star trails above Bryce Canyon National Park, Utah, 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
American Kestrel (Sparrow Hawk) (Falco sparverius), male, Yellowstone National Park, Wyoming, United States of America, North America
Mount Moran in the winter with snow, Grand Teton National Park, Wyoming, United States of America, North America
Greater sage-grouse (Centrocercus urophasianus) in the snow, Grand Teton National Park, Wyoming, United States of America, North America
Sunrise View Piont, Bryce National Park, Utah, United States of America, North America
The Fairweather Range as seen from Fern Harbour, Glacier Bay National Park, Southeast Alaska, United States of America
Hiking the Pa'rus trail, Zion National Park, Utah, 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
Emerald Pool, Black Sand Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Elevated view of Doublet Pool, Firehole River and Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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
Man walking through Mesquite Sand Dunes at dawn, Death Valley National Park, California, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Lenticular clouds over Moose Pond, autumn, Grand Teton National Park, Wyoming, 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
Second Beach, Olympic National Park, UNESCO World Heritage Site, Washington, United States of America, North America
Badlands at dawn, Badlands National Park, South Dakota, United States of America, North America
Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America
Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America
Chaco Culture National Historic Park, World Heritage Site, Pueblo Bonito, kiva (foreground), UNESCO World Heritage Site, New Mexico, United States of America, North America
Mount Hayden at dusk from Point Imperial, North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Tourists at Mather Point overlook, South Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America
Female Williamson's sapsucker (Sphyrapicus thyroideus), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Grizzly bear (Ursus arctos horribilis), Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Columbian ground squirrel (Citellus columbianus) feeding, Glacier National Park, Montana, United States of America, North America
Purple wild flowers, Capitol Reef National Park, Utah, United States of America, North America
Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) with nesting material, Yellowstone National Park, Wyoming, United States of America, North America
Yellow pine chipmunk (Eutamias amoenus), Yellowstone National Park, Wyoming, United States of America, North America
Young bison (Bison bison), Yellowstone National Park, Wyoming, United States of America, North America
Western pasqueflower (Anemone occidentalis), 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
Water reflections of the Teton Range, taken from the end of Schwabacker Road, Grand Teton National Park, Wyoming, United States of America, North America
Coyote (Canis latrans) in the snow, Yellowstone National Park, Wyoming, United States of America, North America
Young mule deer (Odocoileus hemionus) in a snow storm in the Spring, Yellowstone National Park, Wyoming, United States of America, North America
Black bear (Ursus americanus) sow and three cubs of the year, Yellowstone National Park, Wyoming, United States of America, North America
Grizzly bear (Ursus arctos horribilis) in the snow in the spring, Yellowstone National Park, Wyoming, United States of America, North America
Tenaya Lake in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America