When done immediately, these actions have been successful in scaring bears away, but never try to directly retrieve anything once a bear has it. Report all incidents and sightings to a ranger. Cougars - Mountain Lions Mountain lion sightings and encounters have increased throughout Yosemite over the past several years. The lions are an important part of the park ecosystem, helping to keep deer and other prey populations in check. Although lion attacks are rare, they are possible, as is injury from any wild animal.
Pets can attract mountain lions into developed areas.
Avoid walking alone. Watch children closely and never let them run ahead or lag behind on the trail. Talk to children about lions and teach them what to do if they meet one. Store food according to park regulations. Never approach a mountain lion, especially one that is feeding or with kittens.