Mule deer, Grand Teton National Park, 2013.

Mule deer (Odocoileus hemionus) are named for their ears, which resemble those of a mule. Distinguish this deer from white-tailed deer most easily by the ears, color of the tail and configuration of antlers. The mule deer has a black-tipped tail, bifurcated antlers (they fork as they grow) and very large mule-like ears. White-tailed deer do not have these characteristics.