Shattil & Rozinski,Shattil & Rozinski / Mule deer (Odocoileus hemionus), with the Denver skyline and Rocky Mountains in the background, Denver, Colorado, USA, November.

Konstantin Mikhailov / Mule Deer (Odocoileus hemionus columbianus) female running, rear view. Olympic NP, Hurricane Hill, Washington, USA, October 2009.

Floris van Breugel / Dogwood (Cornus nuttallii) in bloom amongst Giant Sequoia trees (Sequoiadendron giganteum) and two Mule deer (Odocoileus hemionus), Sequoia and King's Canyon National Parks, USA. June. Veolia Environn...

Donald M. Jones / Mule Deer (Odocoileus hemionus) buck, western Montana

Shattil & Rozinski / Mule deer (Odocoileus hemionus) buck, Cherry Creek State Park, Denver, Colorado, USA

Bernard Castelein / Male Mule deer portrait (Odocoileus hemionus) Olympic NP, Washington, USA

Rolf Nussbaumer / Mule deer {Odocoileus hemionus} buck portrait, Grand Teton NP, Wyoming, USA

TOM MANGELSEN / Mule deer (Odocoileus hemionus), female nuzzling young. Montana, USA

George Sanker / Mule deer (Odocoileus hemionus) buck drinking at edge of Yellowstone Lake, reflected in water. Yellowstone National Park, Wyoming, USA. June.

George Sanker / Mule deer (Odocoileus hemionus) buck at edge of Yellowstone Lake. Yellowstone National Park, Wyoming, USA. June.

Claudio Contreras / Prehistoric rock painting of Pronghorn antelope, Mule deer and people. El Palmarito cave, Santa Martha Sierra, El Vizcaino Biosphere Reserve, Baja California Peninsula, Mexico.

Jeff Foott / Mule Deer (Odocoileus hemionus) females in meadow, Yosemite National Park, California