I saw Pronghorn at the lovely Custer State Park near Mount Rushmore in South Dakota in late June, 2017. The big deer-like animals are sometimes referred to as American Antelope or Antelope.
This herd of Pronghorn freely roam the huge pasture-lands of this state park but are mostly away from the bison. They sometimes run near fences which is shown on one of these photographs. The big grasslands are fenced because the bison are occasionally kept in that area in rotation.
Pronghorn eat grasses. There are plenty of grasses for them now. These are grazing animals. In my experience, the Pronghorn are pretty wary of people and are most often away from roads. I was glad to have my zoom lens! Please click on the thumbnail image to see the slightly larger version of the photograph. Enjoy!