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Maroon Bells seen from stream rushing to feed Maroon Lake nearby, Aspen, Colorado, Rocky Mountains, USA, North America

View across Nymph Lake at sunrise, with Hallett Peak above the trees, Rocky Mountain National Park, Colorado, United States of America, North America

Orange clouds at sunrise with sulphur paintbrush (Castilleja sulphurea) and cutleaf daisy (dwarf mountain fleabane) (gold buttons) (Erigeron compositus), San Juan National Forest, Colorado, United States of America, North America

Orange clouds at sunrise with cutleaf daisy (dwarf mountain fleabane) (gold buttons) (Erigeron compositus) and sulphur paintbrush (Castilleja sulphurea), San Juan National Forest, Colorado, United States of America, North America

Sunrise behind rosy paintbrush (split-leaf Indian paintbrush) (spliteaf Indian paintbrush) (Castilleja rhexifolia) and Alpine avens (Ross's avens) (Acomastylis rossii turbinata), San Juan National Forest, Colorado, United States of America, North America

Sunrise over Alpine wildflowers, San Juan National Forest, Colorado, United States of America, North America

Alpine sunflowers (Hymennoxys grandiflora), Maroon Lake, Maroon Bells Peaks in background, Maroon Bells Scenic Area, Colorado, United States of America, North America

Maroon Lake and Maroon Bells Peaks in the background, Maroon Bells Scenic Area, Colorado, United States of America, North America

Yellow aspen trees reflected in Priest Lake in the fall, San Juan National Forest, Colorado, United States of America, North America

Maroon Lake and Maroon Bells Peaks in the background, Maroon Bells Scenic Area, Colorado, United States of America, North America

Green-winged teal (Anas crecca) hen swimming, Pike and San Isabel National Forest, Colorado, United States of America, North America

Alpine sunflowers (Hymennoxys grandiflora), Maroon Lake, Maroon Bells Peaks in background, Maroon Bells Scenic Area, Colorado, United States of America, North America

Hoover Dam on the Colorado River forming the border between Arizona and Nevada, United States of America, North America

Lost Lake at dawn in the fall, Grand Mesa-Uncompahgre-Gunnison National Forest, Colorado, United States of America, North America

Clouds reflected in a tarn at Stony Pass, San Juan National Forest, Colorado, United States of America, North America

Yellow aspens among evergreens in the fall reflected in a lake, Uncompahgre National Forest, Colorado, United States of America, North America

First light at Clear Lake, San Juan National Forest, Colorado, United States of America, North America

Yellow aspens among evergreens in the fall reflected in a lake, Uncompahgre National Forest, Colorado, United States of America, North America

Yellow aspens among evergreens in the fall reflected in a lake, Uncompahgre National Forest, Colorado, United States of America, North America

Aspens in fall colors reflected in Crystal Lake, near Ouray, Colorado, United States of America, North America

Snow-capped Red Mountain reflected in Crystal Lake with fall colors, near Ouray, Colorado, United States of America, North America

Maroon Bells with fall colors during a clearing storm in the evening, White River National Forest, Colorado, United States of America, North America

Adult crested guan (Penelope purpurascens), Barro Colorado Island, Gatun Lake, Panama, Central America

Sunset at Dowdy Lake, Red Feather Lakes District, Roosevelt 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

Glen Canyon Dam on the Colorado River, Lake Powell, Glen Canyon National Recreation Area, Page, Arizona, United States of America, North America

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

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

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

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

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

Pica (Pica pica), Clear Lake, San Juan National Forest, Colorado, United States of America, North America

Bullion King Lake at dawn, Porphyry Basin, San Juan National Forest, Colorado, United States of America, North America

Llamas at Laguna Colorado (Red Lake), Eduardo Avaroa Andean National Reserve, Bolivia, South America

Lost Lake at dawn in the fall, Grand Mesa-Uncompahgre-Gunnison National Forest, Colorado, United States of America, North America

Male wood duck (Aix sponsa) swimming, Belmar Historic Park, Lakewood, Colorado, United States of America, North America

Paradise Divide, Grand Mesa-Uncompahgre-Gunnison National Forest, Colorado, United States of America, North America

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

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

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

Pica (Pica pica), Clear Lake, San Juan National Forest, Colorado, United States of America, North America

Lake San Cristobal, Silver Thread Scenic Byway, Colorado, United States of America (U.S.A.), North America

Yellowbelly marmot (Marmota flaviventris), Clear Lake, San Juan National Forest, Colorado, United States of America, North America

Glen Canyon Dam on the Colorado River in northern Arizona with Lake Powell in the background, Arizona, United States of America, North America

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

Bellaire Lake at sunset, Red Feather Lakes District, Roosevelt National Forest, Colorado, United States of America, North America

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

Glen Canyon Dam on the Colorado River in northern Arizona with Lake Powell in the background, Arizona, United States of America, North America

Sunset behind Mirror Lake, Gunnison National Forest, Colorado, United States of America, North America

Glen Canyon Dam on the Colorado River in northern Arizona with Lake Powell in the background, Arizona, United States of America, North America

Snowy mounds on the shore of Sprague Lake, Rocky Mountain National Park, Colorado, United States of America, North America

Glen Canyon Dam, concrete arch 180m high, 475m long, retaining Lake Powell on the Colorado River, Arizona, United States of America, North America

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

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

Maroon Bells at dawn with Maroon Lake in the fall, White River National Forest, Colorado, United States of America, North America

Camping area on shore of Twin Lakes in San Isabel National Forest, with Sawatch Mountains, part of the Rockies, in the background, Aspen, Colorado, United States of America, North America

The Glen Canyon Dam on the Colorado River, that generates power and forms Lake powell, the country's largest resevoir, Glen Canyon, Arizona, USA

Elk crossing, Sprague Lake, Rocky Mountain National Park, Colorado, United States of America, North America

Lake Powell in the Glen Canyon National Recreation area, the country's largest resevoir, formed by the The Glen Canyon Dam on the Colorado River, Glen Canyon, Arizona, USA

Hanging Lake, Glenwood Canyon, Interstate 70, Glenwood Springs, Colorado, United States of America, North America

High angle view of a pasture and a forest on a landscape, Lake Gulch, Castlewood Canyon State Park, Colorado, USA

Pine trees killed by an outbreak of mountain pine beetles which killed millions of acres of pine trees in the American west; scientists expect the problem to worsen due to global warming, because very cold weather is needed to kill the beetles, Grand Lake

View from the Hoover Dam Bypass Bridge to the dam wall of the Hoover Dam, Hoover Dam, Dam, near Las Vegas, Colorado River, Lake Mead, Boulder City, Arizona Border, Nevada, USA, North America

View of the Hoover Dam Bypass Bridge and Dam from the Hoover Dam, Hoover Dam, Dam, near Las Vegas, Colorado River, Boulder City, formerly Junction City, Arizona border, Nevada border, USA, North America

Dam and water intake towers, dam, Colorado River, Hoover Dam, Hoover Dam, Mike O'Callaghan-Pat Tillman Memorial Bridge, Arizona and Nevada, USA, North America

View of the Hoover Dam Bypass Bridge and Dam from the Hoover Dam, Hoover Dam, Dam, near Las Vegas, Colorado River, Lake Mead, Boulder City, former Junction City, Arizona Border, Nevada, USA border

View from the Hoover Dam Bypass Bridge to the dam of the Hoover Dam, Hoover-Dam, Colorado River, Lake Mead, Arizona, Nevada, USA, North America

View of Glen Canyon Dam and Colorado River, Glen Canyon Dam Overlook, Lake Powell, near Page, Arizona, USA, North America

Dam of the Hoover Dam, Hoover Dam, Dam, near Las Vegas, Colorado River, Boulder City, formerly Junction City, Arizona border, Nevada, USA, North America

View from the Hoover Dam Bypass Bridge to the dam of the Hoover Dam, Hoover-Dam, Colorado River, Lake Mead, Arizona, Nevada, USA, North America

A young girl sitting in a Parry's Primrose meadow at a small tarn near Columbine Lake in the San Juan National Forest, Silverton, Colorado, Silverton, Colorado, usa