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The sandstone spire of Castleton Tower dominates the Castle Valley, near the Colorado River and Moab, Utah, United States of America, North America

Bend of Colorado River at Dead Horse Point at sunrise, Dead Horse Point State Park, Utah, United States of America, North America

Orange clouds at dawn over a tarn, San Juan National Forest, Colorado, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

Cliff palace ruins dating from 1200-1300 AD shaded in limestone overhang, Mesa Verde, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America (U.S.A.), North America

Female Mallard (Anas platyrhynchos) swimming, Sterne Park, Littleton, Colorado, United States of America, North America

The Colorado River winds through the sheer cliffs of Marble Canyon, south of the Grand Canyon, Arizona, United States of America, North America

Bend of Colorado River at Dead Horse Point at sunrise, Dead Horse Point State Park, Utah, United States of America, North America

Three mountain goat (Oreamnos americanus) kids, Mount Evans, Colorado, United States of America, North America

Yellow aspens and snow-covered mountains, Uncompahgre National Forest, Colorado, United States of America, North America

Yellow-Bellied Marmot or Yellowbelly Marmot (Marmota flaviventris) pups playing, San Juan National Forest, Colorado, United States of America, North America

Bull elk (Cervus canadensis) standing in a stream, Rocky Mountain National Park, Colorado, United States of America, North America

Young yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) adult and young, San Juan National Forest, Colorado, United States of America, North America

A Chipmunk (Tamias) on a log in the forest of Breckenridge, Colorado, United States of America, North America

Two young yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris), San Juan National Forest, Colorado, United States of America, North America

Young yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris) with grass in its mouth, San Juan National Forest, Colorado, United States of America, North America

Yellow and orange aspen in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

View over Atacama Desert towards Cerro Colorado, San Pedro de Atacama, Antofagasta Region, Chile, South America

Skip Brown surfs his whitewater kayak on a glassy standing wave on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

Bend in Colorado River near Lee's Ferry, Glen Canyon Recreation Area, Vermilion Cliffs National Monument in background, Arizona, United States of America, North America

Looking up at bare aspen trunks, near Silver Jack, Uncompahgre National Forest, Colorado, United States of America, North America

The Colorado River makes a huge S-bend under Deadhorse Point, a famous viewpoint across Canyonlands National Park, near Moab, Utah, United States of America, North America

Whitetail prairie dog (Cynomys luscurus), Arapaho National Wildlife Refuge, Colorado, United States of America, North America

Skip Brown paddles his whitewater kayak through rapids on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

A wavy sandstone formation with a puddle of water north of the Horseshoe Bend Overlook along the Colorado River in Page, Arizona, United States of America, North America

Sandstone hoodoo formation north of the Horseshoe Bend Overlook along the Colorado River in Page, Arizona, United States of America, North America

Adult mantled howler (Alouatta palliata), Barro Colorado Island, Gatun Lake, Panama, Central America

An area of the Little Colorado River Gorge east of the Grand Canyon, Arizona, Uninted States of America, North America

Moose (Alces alces) calf eating, Colorado State Forest State Park, Colorado, United States of America, North America

Black-tailed jackrabbit (Lepus californicus), Pawnee National Grassland, Colorado, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris), San Juan National Forest, Colorado, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

Rock formation known as Swirls on the Colorado Plateau, Arizona, United States of America (U.S.A.), North America

Confluence of the Little Colorado and Colorado Rivers, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

View of the Colorado River from the Glen Canyon Dam Bridge on Highway 89, Arizona, United States of America, North America

Panorama of the Colorado River just north of Lee's Ferry in the Glen Canyon Recreation Area, Arizona, United States of America, North America

An eroded Sandstone hoodoo formation north of the Horseshoe Bend Overlook along the Colorado River in Page, Arizona, United States of America, North America

Montezuma Valley Outlook, the park contains some of the most elaborte Pueblo dwellings found today, Mesa Verde National Park, UNESCO World Heritage Site, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) nanny and kid, Mount Evans, Colorado, United States of America, North America

An adult golden-mantled ground squirrel (Callospermophilus lateralis) feeding, Rocky Mountain National Park, Colorado, United States of America, North America

Rapids on the Colorado River, Marble Canyon, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America

Virgin River und Angel's Landing, Zion National Park, Colorado Plateau, Utah, United States of America, North America

Elk (Cervus canadensis) in Rocky Mountain National Park, Colorado, United States of America, North America

Sandstone hoodoo formation north of the Horseshoe Bend Overlook along the Colorado River in Page, Arizona, United States of America, North America

Owl Creek Pass palisade with fall color, Uncompahgre National Forest, Colorado, United States of America, North America

Two mountain goat (Oreamnos americanus) kids, Mount Evans, Colorado, United States of America, North America

Maroon Bells with fall color, White River National Forest, Colorado, United States of America, North America

Gorges of Colorado River, Dead Horse Point State Park, Moab, Utah, 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

The Dyke with fall colors, Grand Mesa-Uncompahgre-Gunnison National Forest, Colorado, United States of America, North America

Female rufous hummingbird (Selasphorus rufus) perched, Routt National Forest, Colorado, United States of America, North America

Orange aspens in the fall among evergreens covered with snow at a lake, Grand Mesa National Forest, Colorado, United States of America, North America

Orange aspens in the fall among evergreens covered with snow at a lake, Grand Mesa National Forest, Colorado, 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

Skip Brown surfs his whitewater kayak on a glassy standing wave on the Colorado River through the Grand Canyon, Arizona, United States of America, North America

Colorado River flowing through Marble Canyon, viewed above Cathedral Wash, adjacent to the Glen Canyon Recreation Area, Arizona, United States of America, North America

Colorado River flowing through Marble Canyon, viewed above Cathedral Wash, adjacent to the Glen Canyon Recreation Area, Arizona, United States of America, North America

Plateau and canyon country rising 2000 feet above the Grand Valley of the Colorado River, part of the Great Colorado Plateau, Colorado National Monument, Colorado, United States of America, North America

Bear Lake in winter, Rocky Mountain National Park, Colorado, United States of America, North America

Yellow and orange aspen in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

Yellow aspen in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

Panorama of the Colorado River just north of Lee's Ferry in the Glen Canyon Recreation Area, Arizona, United States of America, North America

Yellowbelly marmot (Marmota flaviventris) standing, Mount Evans, Colorado, United States of America, North America

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

Grey Crowned Crane (Southern Crowned Cran) (Balearica regulorum) in captivity, Denver Zoo, Denver, Colorado, United States of America, North America

Yellowbelly marmot (yellow-bellied marmot) (Marmota flaviventris), Mount Evans, Colorado, United States of America, North America

Yellow-bellied marmot (yellowbelly marmot) (Marmota flaviventris), Camp Hale, White River National Forest, Colorado, United States of America, North America

James Flamingo (Phoenicoparrus jamesi), at Laguna Colorado (Red Lake), Eduardo Avaroa Andean National Reserve, Bolivia, South America

Dead Horse Point State Park, view from point down into Colorado River canyon, Moab, Utah, United States of America, North America

Dead Horse Point State Park, view from point down into Colorado River canyon, Moab, Utah, United States of America, North America

Panorama of the Colorado River just north of Lee's Ferry in the Glen Canyon Recreation Area, Arizona, United States of America, North America

Colorado River flowing through Marble Canyon, viewed above Cathedral Wash, adjacent to the Glen Canyon Recreation Area, Arizona, United States of America, North America

Rock formation known as Swirls on Colorado Plateau, Arizona, United States of America (U.S.A.), North America

Rock formation known as Swirls, on Colorado Plateau, Arizona, United States of America (U.S.A.), North America

Plateau and canyon country rising 2000 feet above the Grand Valley of the Colorado River, part of the Great Colorado Plateau, Colorado National Monument, Colorado, United States of America, North America

Plateau and canyon country rising 2000 feet above the Grand Valley of the Colorado River and part of the Great Colorado Plateau, Colorado National Monument, Colorado, United States of America, North America

Young yellowbelly marmot (Marmota flaviventris) grooming, Uncompahgre National Forest, Colorado, United States of America, North America

An adult golden-mantled ground squirrel (Callospermophilus lateralis) feeding in Rocky Mountain National Park, Colorado, United States of America, North America

Blue columbine (Aquilegia coerulea) in a meadow, Maroon Bells-Snowmass Wilderness, White River National Forest, Colorado, United States of America, North America

Mountain goat (antelope) in winter coats on Quandary Peak, a mountain above 14000 feet, known as a 14er, Colorado, United States of America, North America

James Flamingo (Phoenicoparrus jamesi), at Laguna Colorado (Red Lake), Eduardo Avaroa Andean National Reserve, Bolivia, South America

Floating in a raft on the Colorado River, Grand Canyon National Park, UNESCO World Heritage Site, Arizona, United States of America, North America