Tim Fitzharris / Grand Tetons from Schwabacher Landing, Grand Teton National Park, Wyoming

Tim Fitzharris / Grand Tetons from String Lake, Grand Teton National Park, Wyoming

Tim Fitzharris / Clouds at sunset, Black Canyon of the Gunnison National Park, Colorado

Tim Fitzharris / String Lake and the Grand Tetons, Grand Teton National Park, Wyoming

Staffan Widstrand / American Bison (Bison bison) in habitat, Grand Teton National Park, Wyoming, USA, October.

George Sanker / Limber Pine (Pinus flexilis) against high mountain peaks. Grand Teton National Park, Wyoming, USA. Autumn 2010.

Jack Dykinga / Willow, Cottonwood and Aspen trees on the banks of the Oxbow Bend, Snake River, at dawn, Teton mountain range in the background, Grand Teton National Park, Wyoming, USA

Jeff Vanuga / Historic Barn illuminated at night by the light of a full moon, Mormon Row, Grand Teton National Park, Wyoming, USA, May 2009

Yva Momatiuk & John Eastcott / Grand Teton peak with cumulus clouds, Grand Teton National Park, Wyoming

Tim Fitzharris / Grand Teton Range and cloudy sky at Schwabacher Landing, Grand Teton National Park, Wyoming

Tim Fitzharris / Mt Moran and String Lake, Grand Teton National Park, Wyoming

Tim Fitzharris / Teton Range at sunrise, Schwabacher Landing, Grand Teton National Park, Wyoming