Date 1898
Source The deer of all lands; a history of the family Cervidæ living and extinct
Author Richard Lydekker (1849–1915)
Source: https://commons.wikimedia.org/wiki/File:The_deer_of_all_lands_(1898)_Mule_deer.png

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.