353 Mule deer Odocoileus The mule deer (Odocoileus hemionus) is a deer indigenous to western North America; it is named for its ears, which are large like those of the mule. There are believed to be several subspecies, including the black-tailed deer. Unlike its cousin, the white-tailed deer (Odocoileus virginianus), mule deer are generally more associated with the land west of the Missouri River, and more specifically with the Rocky Mountain region of North America. Mule deer have also been introduced to Argentina. 180697 Mule deer 353.jpg image/jpeg 142724 380 Animal foods Venison Type 1 2018-01-18T03:18:03Z 2019-05-14T18:04:23Z false specific 9871 true FOOD00348