People rarely get more than a brief glimpse of a mountain lion in the wild. Lion attacks on people are rare, with fewer than a dozen fatalities in North America over the past 100 years. Most of the attacks were by young mountain lions, perhaps forced out to hunt on their own and not yet living in established areas. Young mountain lions may key in on easy prey, like pets and small children.
No studies have been done to determine what to do if you meet a mountain lion, but based on observations by people who have come upon lions, some patterns of behavior and response are beginning to emerge.
In this short video, Colorado Parks and Wildlife offers several tips and information on living and recreating in mountain lions country:
Mountain Lion Safety from Colorado Parks & Wildlife on Vimeo.