Pronghorn image by James Leupold of USFWS

Public Domain Image: USFWS

Pronghorn, sometimes known as American Antelope, are the only remaining representatives of their taxonomic family, and are not true antelopes. They occur throughout much of the short grass prairie and Rocky Mountain regions of the western U.S. Pronghorn are the fastest land animal in North America, able to run up to 70 miles per hour. They are active both day and night, pausing only briefly for sleep.