Formerly rare, now abundant in all the southerly third of the Park. In 1897 they were estimated at 50. The official census gives their number at 550 in 1912.
Antelope or Pronghorn (Antilocapra americana)
Formerly abundant, now rare; found only in broad open places such as Lamar Valley, etc. Their numbers have shrunk from many thousands in the '70's to about 1,500 in 1897, and 500 in 1912.
Mountain Sheep or Bighorn (Ovis canadensis)
Formerly rare, now common about Mt. Evarts, Mt. Washburn and the western boundary. In 1897 there were about 100, perhaps only 75; in 1912 they are reported numbering 210 by actual count.
American Buffalo or Bison (Bison bison)
Steadily increasing. In 1897 there were about 30; they now number 199 by actual count. These are in two herds, of 49 wild, and 150 in the fenced corrals.
Richardson Red-squirrel (Sciurus hudsonicus richardsoni)
Abundant in all pine woods.
Northern Chipmunk (Eutamias quadrivittatus luteiventris)