Close-up of squirrel sitting on wooden post, Rocky Mountain National Park, Colorado, USA

Dry grass in field with mountain range in background, Great Sand Dunes National Park, Colorado, USA

Reflection of clouds and trees in water, Bear Lake, Rocky Mountain National Park, Holy Cross Wilderness, Colorado, USA

Caribou (Rangifer tarandus) reindeer standing in field, Mt McKinley, Denali national park, Alaska, USA

Caribou (Rangifer tarandus) reindeer standing in field, Mt McKinley, Denali national park, Alaska, USA

Herd of American Bison (Bison bison) grazing in field, Yellowstone National Park, Wyoming, USA

elk (Alces alces), Alaska, Denali National Park, USA

Deer standing in field, Rocky Mountain National Park, Colorado, USA