Mule Deer in the Badlands of Snow Creek, Montana, USA, by Carl Rungius

Title: The American natural history : a foundation of useful knowledge of the higher animals of North America
Year: 1914 (1910s)
Authors: William Temple Hornaday, 1854-1937
Subjects: Natural history -- North America
Source book page: https://archive.org/stream/americannaturalh02hornuoft/americannaturalh02hornuoft#page/n94/mode/1up
Source: https://commons.wikimedia.org/wiki/File:The_American_natural_history_-_a_foundation_of_useful_knowledge_of_the_higher_animals_of_North_America_(1914)_(14597535607).jpg

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.