Mountain lions are common within Grand Canyon National Park, but visitors rarely see them since they tend to blend in with the canyon's landscape and do not actively approach people. Though there is not a spot where the lions typically hang out, they do tend to like the banks of the cool Colorado River.
Rangers say if you run into a lion make sure not to run and to raise your arms above your head to appear bigger and stand your ground. Make eye contact and continue to stand strong. If you run it will only increase the possibility of being attacked.