Barbary sheep
African sheep (Barbary sheep), mule deer, white-tailed deer, coyotes, opossums, raccoons, bobcats, foxes, porcupines, numerous species of snakes and lizards, and over 175 species of birds including golden eagles are found within the park. Lake Theo contains bass, catfish, and rainbow trout. In the summer of 2012 black-tailed prairie dogs were reintroduced to a area within the park.