Bear incidents are up this year in comparison to past years, while property damage is down. Activity in Yosemite Valley’s campgrounds, and other lodging facilities has remained consistently high this summer. This week, bears have been getting into vehicles to obtain food left inside, even during the day. If you are in Yosemite during the day, please keep your food contained inside your vehicle, out of sight, with your windows closed. Never leave food unattended outside. Do not leave food in the back of an unattended pick-up truck.
Multiple bears have been observed at Glacier Point this week. These bears have obtained food from people who left food unattended.
More info: http://www.nps.gov/yose/planyourvisit/bearfacts.htm