Ring-tailed cats, black bears, mountain lions, elk, deer, rattlesnakes, scorpions, canyon wrens, hermit thrushes, and many other creatures frequent the wilderness. Vegetation, which varies with elevation and the availability of water, includes stands of pine, fir, sycamore, walnut, and cottonwood. The canyon walls include exposures of red sandstone, white limestone, and brown lava. Parts of the wilderness are open for dispersed camping; many trails are open for horseback riding as well as hiking.