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Pronghorn (Antilocapra americana) in the snow, Grand Teton National Park, Wyoming, United States of America, North America

Petrified wood and an eroded hill, Petrified Forest National Park, Arizona, United States of America, North America

Reflection Lake, Mount Rainier National Park, Washington State, United States of America, North America

Hermit Canyon at Grand Canyon viewed from the east side of Yuma Point along the Boucher Trail with Pima Point on the upper right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

American Tree Sparrow (Spizella arborea), Yellowstone National Park, Wyoming, United States of America, North America

Black Bear (Ursus americanus) sow and cub-of-the-year crossing the road, Yellowstone National Park, Wyoming, United States of America, North America

Glacier Bay National Park, viewed from Princess Star Cruise Ship, Alaska, United States of America, North America

Granite mountains with Half Dome in the background, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

View over Yosemite National Park with Half Dome, UNESCO World Heritage Site, California, United States of America, North America

Landscape from La Sal Mountains Viewpoint, Arches National Park, Moab, Utah, United States of America, North America

Deer wandering Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View along the tranquil Merced River below Stoneman Bridge, autumn, Yosemite Village, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Mormon Row and Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

Black-legged kittiwake (Rissa tridactyla) in flight at South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

Evening light on mountain peaks, view from Hurricane Ridge, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Grand Canyon viewed from the Desert View Point at night illuminated by moonlight, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

75 Mile Creek from the Tanner Trail in the Grand Canyon, with Lipan Point on the upper left and Escalante Butte on the upper right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Sand Beach, Mount Desert Island, Acadia National Park, Maine, New England, United States of America, North America

Adult hoary marmot (Marmota caligata), on the Skyline Trail, Mount Rainier National Park, Washington State, United States of America, North America

A hiker in Marble Canyon along the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

The naturally formed Redwall Cavern, Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View from Cape Royal Point of the north rim of Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Adult North American porcupine (Erethizon dorsatum), climbing a tree, Glacier Bay National Park, Alaska, United States of America, North America

Tufted puffin (Fratercula cirrhata) taking flight at South Marble Island, Glacier Bay National Park, Alaska, United States of America, North America

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

A rock hoodoo shaped like a horse head, along the base of Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

An eroded sandstone formation called a Sandcastle, below the Blue Mesa in Petrified Forest National Park, Arizona, United States of America, North America

Giant Sequoia, Mariposa Grove, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Mammoth Hot Springs Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

An adult brown bear (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

Three hoodoos in a triangular formation in Devil's Playground called the Unholy Trinity, Petrified Forest National Park, Arizona, United States of America, North America

An ominous looking hoodoo in Devil's Playground at Petrified Forest National Park, Arizona, United States of America, North America

Fall color change amongst the trees and shrubs in Denali National Park, Alaska, United States of America, North America

Commercial rafters run the Sheer Wall Rapid, just past river mile 14, Grand Canyon National Park, Arizona, United States of America, North America

Two of three ponds called the Hearst Tanks, on Grand Canyon South Rim, located one mile east of Grandview Point, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A paved walkway leading to the entrance of the Long Logs Trail in Petrified Forest National Park, Arizona, United States of America, North America

Saguaro cactus (Carnegiea gigantea), Saguaro National Park, Arizona, United States of America, North America

Grand Teton National Park plains and mountains, Jackson, Wyoming, United States of America, North America

Woman looking over Grand Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

A woman walking along the S curve of a dune's ridge in White Sands National Park, New Mexico, United States of America, North America

Chesler Park, The Needles section of Canyonlands National Park, Utah, United States of America, North America

Crystaline deposit salt pillars in the corrugated Badlands landscape at Devils Golf Course, Death Valley National Park, California, United States of America, North America

Mesa Top Loop Road Ruins, Pueblo ruins in Mesa Verde containing some of the most elaborte Pueblo dwellings found today, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Porcelain Basin, Norris Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, 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

Winter scene in the Badlands, Badlands National Park, South Dakota, United States of America, North America

A view of Johns Hopkins Glacier against the Fairweather Range in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Alaska, United States of America, North America

A view of Margerie Glacier against the Fairweather Range in Glacier Bay National Park and Preserve, UNESCO World Heritage Site, Alaska, United States of America, North America

American bison (Bison Bison) in a driving snow storm, Badlands National Park, South Dakota, United States of America, North America

A view of Spire Cove in Resurrection Bay in Kenai Fjords National Park, Alaska, United States of America, North America

South Window Arch seen through Turret Arch, Arches National Park, Utah, United States of America, North America

Bull moose (Alces alces), standing in front of Teton Range, Grand Teton National Park, Wyoming, United States of America, North America

Frozen bison (Bison bison), sticking out tongue, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

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

A rock spire sculpted by the wind on Crystal Mesa west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

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

Elk (Cervus canadensis) crossing the Madison River, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Gallatin Range and Swan Lake Flats, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Three Gossips and common paintbrush (Castilleja chromosa), Arches National Park, Utah, United States of America, North America

View from Zabriskie Point, Death Valley National Park, California, United States of America, North America

Autumn colours at Bowman Lake, Glacier National Park, Montana, United States of America, North America

An overlook along the Transept Trail with Oza Butte just right of center at Grand Canyon North Rim, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View of Grand Canyon from Bright Angel Point on the North Rim, with Brahma and Zoroaster Temples visible in the distance an Oza Butte on far right, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Aialik Glacier, glacial calving splash, blue ice, Harding Icefield, Kenai Fjords National Park, near Seward, Alaska, United States of America, North America

Half Dome mountain catches the last glow of sunset reflected in the Merced river in Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Adult brown bears (Ursus arctos) fishing for salmon at Brooks Falls, Katmai National Park and Preserve, Alaska, United States of America, North America

Early morning, Teton Range from Schwabache Landing, Grand Teton National Park, Wyoming, United States of America, North America

Vermillion Lakes, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

Two Jack Lake sunrise with Mount Rundle, Banff National Park, UNESCO World Heritage Site, Alberta, Canadian Rockies, Canada, North America

View by moonlight over Badwater Basin to the Panamint Range, Dante's View, Death Valley National Park, California, United States of America, North America

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

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

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

Panorama view of Tuzigoot Ruins from southeast corner, managed by the National Park Service, Arizona, United States of America, North America

View down Zion Canyon from Angels Landing, Zion National Park, Utah, United States of America, North America

Snow-capped mountains reflected in the calm waters of Phelps Lake, Grand Teton National Park, Wyoming, United States of America, North America

Rock covered in barnacles, First Beach at dawn, Olympic National Park, UNESCO World Heritage Site, Washington State, United States of America, North America

Adult hoary marmot (Marmota caligata), on the Deadhorse Creek Trail, Mount Rainier National Park, Washington State, United States of America, North America

Early light on Mount Rainier from the Burroughs Mountain Trail, Mount Rainier National Park, Washington State, United States of America, North America

An adult sea otter (Enhydra lutris), swimming in Glacier Bay National Park, Southeast Alaska, United States of America, North America

A Bentonite formation in Petrified Forest National Park near Crystal Forest called the Battleship, Arizona, United States of America, North America

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

Beautiful sight on The Petrified Forest Loop Trail inside Theodore Roosevelt National Park, North Dakota, United States of America, North America

Hills of blood red bentonite clay below Kachina Point in Petrified Forest National Park, Arizona, United States of America, North America

An adult tufted puffin (Fratercula cirrhata) bathing in the ocean in Kenai Fjords National Park, Alaska, United States of America, North America

A hiker standing on a cliff between Zuni and Papago Points at Grand Canyon on a stormy day, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Full frame abstract shot of natural rock formations at Zabriskie Point at sunrise, Death Valley National Park, California, USA

Inside the Big Room at Carlsbad Caverns National Park, UNESCO World Heritage Site, located in the Guadalupe Mountains, New Mexico, United States of America, North America

Sequoia trees in the Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America