Klein & Hubert / Mule deer (Odocoileus hemionus) fawn, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

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...

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

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

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

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

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

George Sanker / Mule Deer (Odocoileus hemionus) female with newborns. Yellowstone National Park, Wyoming, USA.

Jack Dykinga / Mule deer (Odocoileus hemionus) in burnt forest, after Wallow Fire, Apache-Sitgreaves National Forest, Arizona, USA, August

Jeff Vanuga / Mule deer (Odocoileus hemionus) albino doe. Wyoming.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, USA.

Klein & Hubert / Mule deer (Odocoileus hemionus) fawn in summer, Wyoming, 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.

Jack Dykinga / Black-tail deer (Odocoileus hemionus columbianus) eating improperly disposed garbage along with plastic wrapping. Olympic National Park, Washington, USA, June.

Jack Dykinga / Black-tail deer (Odocoileus hemionus columbianus) eating improperly disposed garbage along with plastic wrapping. Olympic National Park, Washington, USA, June.

Jack Dykinga / Roosevelt elk (Cervus canadensis roosevelti) stag in velvet, Del Norte Redwoods National Park, California, USA. June Completed Review

Phil Savoie / Mule deer (Odocoileus hemionus) in long grass, Madison Mountains, Montana, USA. September.

Jouan Rius / Mule Deer (Odocoileus hemionus) stag Antelope Island State Park, Great Salt Lake, Utah, USA, March.

Jouan Rius / Mule deer (Odocoileus hemonius) doe, Bryce Canyon National Park, Utah, USA, March.

Connor Stefanison / Mule deer (Odocoileus hemionus) buck in snow near Jasper, Jasper National Park, Alberta, Canada. December.

Connor Stefanison / Mule deer (Odocoileus hemionus) buck resting in snow near Jasper, Jasper National Park, Alberta, Canada. December.

Gerrit Vyn / Pronghorn (Antilocapra americana) skeleton caught in a sheep fence. Both antelope, which jump poorly, and deer commonly get their legs caught in livestock fences leading to a slow suffering death. Obs...

Carol Walker / RF - Head portrait of wild Mustang stallion in profile, Pryor Mountains, Montana, USA. (This image may be licensed either as rights managed or royalty free.)

Gerrit Vyn / Bald eagle (Haliaeetus leucocephalus) feeding on Mule deer roadkill in winter snow, Okanogan County, Washington, USA

Gerrit Vyn / Bald eagle (Haliaeetus leucocephalus) feeding on Mule deer roadkill in winter snow, Okanogan County, Washington, USA

George Sanker / Mule deer (Odocoileus hemionus) mother with newborn twins. Yellowstone National Park, Wyoming, USA. June.

George Sanker / Mule deer (Odocoileus hemionus) newborn twins following mother, Yellowstone National Park, Wyoming, USA, June.

George Sanker / Mule deer (Odocoileus hemionus) newborn twins following mother, Yellowstone National Park, Wyoming, USA, June.

George Sanker / Mule deer (Odocoileus hemionus) female with newborn fawns. Yellowstone National Park, Wyoming, USA, June.

George Sanker / Mule Deer (Odocoileus hemionus), mother tends to her just-born twin fawns. Yellowstone National Park, Wyoming, USA, June

Bertie Gregory / Columbian black-tailed deer (Odocoileus hemionus columbianus), foraging on seaweed at sunset, Vancouver Island, British Columbia, Canada, July.

Jeff Vanuga / Mule deer (Odocoileus hemionus) bucks fighting during rut. Wyoming, USA, October.

Jeff Vanuga / Mule deer (Odocoileus hemionus) buck during rut. Wyoming, USA, October.

Mary McDonald / Black-tailed mule deer (Odocoileus hemionus) Yellowstone National Park, Wyoming, USA, September.

George Sanker / Mule Deer (Odocoileus hemionus) mother with newborn twins. Yellowstone National Park, Wyoming, USA, June.