Male horns may grow to 20 inches with a short prong jutting forward and upward halfway from the base. The Pronghorn inhabits open plains and semi-deserts, living alone or in small bands in summer and forming large herds in winter. Being highly mobile, the Pronghorn may cover a large area during the year. Pronghorn can survive a temperature range of 180 degrees, from 130 in the deserts to 50 below zero. This high-strung animal is active night and day, combining alternate snatches of sleep with vigilant feeding.
Pronghorn are selective, opportunistic foragers.
They feed on forbs, shrubs, grasses, juniper, chamiso and sometimes cacti and domestic crops. In winter, desert populations are said to favor Sagebrush. When alerted to danger, they contract their rump muscles causing their white rump hairs to stand on end, which other Pronghorn may detect from 2 miles away. At the same time, they exude a musky odor, which can be detected for more than a mile. In late summer or early Fall, the male gathers a harem of about 3 or 4 does.