A mountain lion was sighted by the pit parking lot at approx. 6:10 a.m. this morning. Mountain lions generally exist where deer are found. Warning signs have been placed at walkways and gate entrances. As a precaution, the use of isolated stairs and walkways at dusk, night, or dawn is discouraged. To limit an interaction with a mountain lion, avoid hiking or jogging in the undeveloped areas of the Lab alone or at dawn, dusk or night. If you see a mountain lion, immediately call 7-911 from any Lab phone or 911 from any cell phone. Go here for more safety information from the California Department of Fish and Game.