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Male Audubon's Yellow-Rumped Warbler (Dendroica coronata auduboni), Yellowstone National Park, Wyoming, United States of America, North America

Mountain bluebird (Sialia currucoides) pair at their nest, Yellowstone National Park, Wyoming, United States of America, North America

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

The northern part of the Roosevelt National Park, North Dakota, United States of America, North America

Common raven (Corvus corax), Petrified Forest National Park, Arizona, United States of America, North America

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

Hiker and tent illuminated under the night sky, Great Sand Dunes National Park, Colorado, United States of America, North America

Red leaves on a bigtooth maple (Acer grandidentatum) surround a Ponderosa pine trunk in the fall, Zion National Park, Utah, United States of America, North America

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

The Virgin River, foot bridge to access the Emerald Pools, Zion National Park, Utah, United States of America, North America

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

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

Female mountain bluebird (Sialia currucoides) with a caterpillar, Yellowstone National Park, Wyoming, United States of America, North America

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

Black bear (Ursus americanus) sow and cub-of-the-year coming down from a tree, Yellowstone National Park, Wyoming, United States of America, North America

Black bear (Ursus americanus) sow and two cubs-of-the-year, one nursing and one coming down from a tree, Yellowstone National Park, Wyoming, United States of America, North America

Mule deer graze in Tuolumne Meadows near Lembert Dome, Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Black bear (Ursus americanus) in the spring, 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

Enjoying the view from Angels Landing, Zion National Park, Utah, United States of America, North America

Hikers on the trail to Angels Landing, Zion National Park, Utah, United States of America, North America

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

Petroglyphs, created by the prehistoric Hohokam people, about 1000 years ago, West-Tucson Mountain District, Saguaro National Park, Arizona, United States of America, North America

Sentinel Dome, Yosemite National Park, UNESCO World Heritage Site, California, 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

Eruption of Castle Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, 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

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

Alpine Shooting Star (Dodecatheon alpinum), Yellowstone National Park, Wyoming, United States of America, North America

Mount McKinley (Mount Denali), Denali National Park and Preserve, Alaska, 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

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

Ocotillo cactus (Fouquieria Splendens) in foreground, Saguaro cactus (Camegiea Gigantea) in background, West-Tucson Mountain District, Saguaro National Park, Arizona, United States of America, North America

Saguaro Cactus (Camegiea Gigantea) silhouetted at sunset, West-Tucson Mountain District, Saguaro National Park, Arizona, United States of America, North America

Summit ridge, climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

Mount McKinley, 6194m, highest mountain in North America, Denali National Park, Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, United States of America, North America

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

Mountain goat (Oreamnos americanus) nanny and kid, Glacier National Park, Montana, United States of America, North America

Tlingit Housepost in Sitka National Historical Park, Sitka, Baranof Island, Southeast Alaska, United States of America, North America

Sandstone hoodoos in Bryce Amphitheater, sunrise with low mist, Bryce Canyon National Park, Utah, United States of America, North America

Mountains and a stream through the tundra in fall color, Denali National Park and Preserve, Alaska, United States of America, North America

Reflections in pools among the sandstone, Zion National Park, Utah, United States of America, North America

Wolf lichen (Letharia vulpina), on Sugar Pines (Pinus lambertiana), Tuolumne Grove of Giant Sequoias, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America

Upper and Lower Yosemite Falls, Yosemite Valley, Yosemite National Park, UNESCO World Heritage Site, Sierra Nevada, California, United States of America, North America

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

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

Common raven (Corvus corax) pair, Yellowstone National Park, Wyoming, United States of America, North America

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

American avocet (Recurvirostra americana), Yellowstone National Park, Wyoming, United States of America, North America

Firefighting helicopter fighting the Dog Rock wildfire above the smoke filled forests of Yosemite National Park, UNESCO World Heritage Site, California, United States of America, North America

Mesa Arch at sunrise, Canyonlands National Park, Utah, United States of America (U.S.A.), 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

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

Slump Block area in Theodore Roosevelt National Park North Unit, Watford, North Dakota, 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

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

Sunset on Lake Quinault, Olympic National Park, UNESCO World Heritage Site, Washington. United States of America, North America

River and colourful foliage in the Indian summer, Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

View over valley with colourful foliage in the Indian summer, Great Smoky Mountains National Park, UNESCO World Heritage Site, Tennessee, United States of America, North America

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

Black Bear (Ursus americanus) sow climbing a tree, 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

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

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

Teddy Bear Cholla cactus (Cylindropuntia Bigelovil), West-Tucson Mountain District, Saguaro National Park, Arizona, 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

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

Johns Hopkins Glacier calving, Fairweather Range, Glacier Bay National Park and Preserve, Southeast Alaska, United States of America, North America

Climbing expedition on Mount McKinley, 6194m, Denali National Park, Alaska, 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

Tent illuminated under the night sky, Rocky Mountain National Park, Colorado, United States of America, North America

Siltstone eroded formations of Zabriske Point, Furnace Creek, Death Valley National Park, California, 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

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

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

Grizzly bear (Ursus arctos horribilis), Glacier National Park, Montana, 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

Mountain bluebird (Sialia currucoides) with a grub, Yellowstone National Park, Wyoming, United States of America, North America

Western false Solomon's seal (false Solomon's seal) (Solomon's plume) (treacleberry) (false spikenard) (Maianthemum racemosum), Glacier National Park, Montana, United States of America, North America

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

Rock formations, Chesler Park, The Needles district, Canyonlands National Park, Utah, 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