Chase Dekker / Red Fox (Vulpes vulpes) in winter, Grand Teton National Park, Wyoming

Chase Dekker / Great Gray Owl (Strix nebulosa), Grand Teton National Park, Wyoming

Chase Dekker / Moose (Alces alces shirasi) bull flehming in autumn, Grand Teton National Park, Wyoming

Chase Dekker / Moose (Alces alces shirasi) bull flehming in autumn, Grand Teton National Park, Wyoming

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

Radomir Jakubowski / Red fox (Vulpes vulpes) face portrait in snow, Grand Teton National Park, Wyoming, USA, February.

Radomir Jakubowski / Red fox (Vulpes vulpes) in snowfall, Grand Teton National Park, Wyoming, USA, February.

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

Matthias Breiter / American Bison (Bison bison) herd grazing, Grand Teton National Park, Wyoming

Jeff Vanuga / Shiras moose (Alces alces shirasi) bull in rut. Grand Teton National Park, Wyoming, USA, October.