A male Pronghorn stands above the Sage Brush. Pronghorn are one of my favorite Yellowstone animals. They have a beautiful coloration. Pronghorn are often referred to as Pronghorn Antelope, but are not a member of the antelope family (Bovidae). Instead, it is the only species in its family (Antilocapridae). The Pronghorn is the 2nd fastest land animal after the Cheetah.