Near Ione, Nevada, USA. Even at the distance I am with the telephoto they're fixin' to leave... They're a lot warier than that bunny by Knott Creek Reservoir! The pronghorn "antelope" (Antelocapra americana) isn't a true antelope at all, but the last surviving member of a whole group of ruminants intermediate between deer and cows/true antelopes. Both sexes have horns, with the males' much larger, that have a bony core with an outer sheath shed annually.