Mule deer
Raccoons, weasels, bobcats, gray foxes, and mountain lions are also present but are much rarer. Mule deer and desert bighorn sheep are the ungulates that frequent the river corridor. Since the removal of 500 feral burros in the early 1980s, bighorn sheep numbers have rebounded. Mule deer are generally not permanent residents along the river but travel down from the rim when food and water resources there become scarce.