“Sunday Morning” takes us among pronghorn antelope at play near Virginia City in Montana. Videographer: Brad Markel.

The pronghorn is a species of artiodactyl (even-toed, hoofed) mammal indigenous to interior western and central North America. Though not a true antelope, it is known colloquially in North America as the American antelope, prong buck, pronghorn antelope, prairie antelope, or simply antelope because it closely resembles the antelopes of the Old World and fills a similar ecological niche due to parallel evolution. It is the only surviving member of the  family Antilocapridae.