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Alpine waterfall with wildflowers at sunset, San Juan National Forest, Colorado, United States of America, North America

Bighorn sheep (Ovis canadensis) ram durng the rut, Clear Creek County, Colorado, United States of America, North America

Petroglyphs, Colorado River basin, 6000 BC to 1300 AD, Utah, United States of America, North America

Wilson Peak with a dusting of snow in the fall, San Juan National Forest, Colorado, United States of America, North America

Mesa Verde National Park, Cliff Palace, UNESCO World Heritage Site, Colorado, United States of America, North America

Bull moose (Alces alces) in velvet, Roosevelt National Forest, Colorado, United States of America, North America

Museum of Contemporary Art, Lower Downtown, Denver, Colorado, United States of America, North America

Rosy paintbrush (split-leaf Indian paintbrush) (splitleaf Indian paintbrush) (Castilleja rhexifolia), San Juan National Forest, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) nanny and kid, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Two-track lane through fall aspens, near Telluride, Colorado, United States of America, North America

Wilson Peak at dawn in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

One sided penstemon (sidebells penstemon) (Penstemon secundiflorus), San Juan National Forest, Colorado, United States of America, North America

American pika (Ochotona princeps), San Juan National Forest, Colorado, 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

Alpine meadow with orange sneezeweed (Hymenoxys hoopesii) (Dugaldia hoopesii) (Helenium hoopesii) and other wildflowers, San Juan National Forest, Colorado, United States of America, North America

Summer wildflowers in Colorado's San Juan mountains, Colorado, United States of America, North America

Casa Colorado, Mayan ruins, Chichen Itza, UNESCO World Heritage Site, Yucatan, Mexico, North America

Canada Goose (Branta canadensis) with reflection while swimming and drinking, Denver City Park, Denver, Colorado, United States of America, North America

Columbian ground squirrel (Citellus columbianus) feeding, Glacier National Park, Montana, United States of America, North America

Waterfall on Clear Creek, San Juan National Forest, Colorado, United States of America, North America

Fireweed (Chamerion angustifolium), San Juan National Forest, Colorado, United States of America, North America

San Juan Mountains from Black Bear Pass Road, San Juan National Forest, Colorado, United States of America, North America

Western kingbird (Tyrannus verticalis), Pawnee National Grassland, Colorado, United States of America, North America

Thirteen-lined ground Squirrel (Citellus tridecemlineatus) feeding, Pawnee National Grassland, Colorado, United States of America, North America

Common nighthawk (Chordeiles minor), Pawnee National Grassland, Colorado, United States of America, North America

White-tailed ptarmigan (Lagopus leucurus) chick, San Juan National Forest, Colorado, United States of America, North America

Swift fox (Vulpes velox) kit, Pawnee National Grassland, Colorado, United States of America, North America

Swift fox (Vulpes velox) kits playing, Pawnee National Grassland, Colorado, United States of America, North America

White-tailed Ptarmigan (Lagopus leucurus) among wildflowers, Mineral Basin, San Juan National Forest, Colorado, 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

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

Aspen trunks among yellow leaves, Uncompahgre National Forest, Colorado, United States of America, North America

Closing Era statue, State Capitol Building, Denver, Colorado, United States of America, North America

Colorado chipmunk (Eutamias quadrivittatus) eating, San Juan National Forest, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) nanny and kids, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) nanny resting, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Bighorn sheep (Ovis canadensis) ram durng the rut, Clear Creek County, Colorado, United States of America, North America

Clouds over Palisades at sunset, Uncompahgre National Forest, Colorado, United States of America, North America

American pika (Ochotona princeps) among yellow wildflowers, San Juan National Forest, Colorado, United States of America, North America

Steller's jay (Cyanocitta stelleri), Rocky Mountain National Park, Colorado, 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

Mount Sneffels at first light with a dusting of snow in the fall, Uncompahgre National Forest, 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

Star gentian (felwort) (Swertia perennis), San Juan National Forest, Colorado, United States of America, North America

White-tailed ptarmigan (Lagopus leucurus) in summer plumage, San Juan National Forest, Colorado, United States of America, North America

Sunset over an Alpine tarn at Stoney Pass, San Juan National Forest, Colorado, United States of America, North America

Female lark bunting (Calamospiza melanocorys), Pawnee National Grassland, Colorado, United States of America, North America

Sand dunes in the Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Mesa Verde National Park, Spruce Tree House, UNESCO World Heritage Site, Colorado, United States of America, North America

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

Summit of Longs Peak, a mountain above 14000 feet, known as a 14er, Rocky Mountain National Park, Colorado, United States of America, North America

Butter-and-eggs (common toadflax) (yellow toadflax) (Linaria vulgaris), San Juan National Forest, Colorado, United States of America, North America

Roseroot (king's crown) (Sedum rosea), Gunnison National Forest, Colorado, United States of America, North America

Two bighorn sheep (Ovis canadensis) rams during the rut, Clear Creek County, Colorado, United States of America, North America

Fall Colors, Road 7, Sneffels Range in the background, near Ouray, 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

Bull moose (Alces alces), Roosevelt National Forest, Colorado, United States of America, North America

Mears Peak and the Sneffels Range in the winter, Uncompahgre National Forest, Colorado, United States of America, North America

Hikers 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

Couple hiking below Mount Baker, Rocky Mountain National Park, Colorado, United States of America, North America

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

Evergreen among yellow and green aspens in the fall, Uncompahgre National Forest, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus), Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Parry's primrose (Primula parryi), San Juan National Forest, Colorado, United States of America, North America

Mountain goat (Oreamnos americanus) nanny, Mount Evans, Arapaho-Roosevelt National Forest, Colorado, United States of America, North America

Sunrise in an Alpine meadow with wildflowers, San Juan National Forest, Colorado, United States of America, North America

Snow pillows on the Dolores River, San Juan National Forest, Colorado, United States of America, North America

Lizard Head in the winter, Uncompahgre National Forest, Colorado, United States of America, North America

Wildflowers and mountains near Cinnamon Pass, Uncompahgre National Forest, Colorado, United States of America, North America

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

Patches of yellow aspens in the fall under pink clouds, Uncompahgre National Forest, Colorado, United States of America, North America

Orange aspens in the fall, San Juan National Forest, Colorado, United States of America, North America

Tourist overlooking Horseshoe Bend on the Colorado River, Page, Arizona, United States of America, North America

Colorado chipmunk (Eutamias quadrivittatus) eating, San Juan National Forest, Colorado, United States of America, North America

Punta Colorado, Isla San Jose, Gulf of California (Sea of Cortez), Baja California Sur, Mexico, North America

City skyline viewed across the Colorado River, Austin, Texas, United States of America, North America

Giant tortoise (Geochelone nigra) at the Galapaguera de Cerro Colorado, tortoise breeding center, Isla San Cristobal (San Cristobal Island), Galapagos Islands, UNESCO World Heritage Site, Ecuador, South America

Sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America