Cougars hunt mule deer here at night. "S. hemionilatrantis" infects mule deer. In the eastern Sierra Nevadas, coyotes compete with cougars over mule deer. Whitetail deer, mule deer, and moose are also found in abundance. Some feature native wildlife such as whitetail deer, mule deer, bison or elk. Mule deer readily adapt to agricultural products and landscape plantings. Other game species include turkey, bear, bighorn sheep, elk and mule deer. The size of mule deer groups follows a marked seasonal pattern. Desert cottontails, kangaroo rats and mule deer are commonly seen by visitors. In 1991 there was a three-year average of 420 mule deer. The plateau's pre-1905 population of mule deer was estimated to be around 4,000. Mule deer, bighorn sheep and fox are common. Besides humans, the three leading predators of mule deer are coyotes, wolves, and cougars. Mule deer apparently evolved from the black-tailed deer. Native ungulates include the white tailed deer, mule deer, and collared peccary.