Lime Ridge Bird Walk

The Lime Ridge bird walk is led by Maury Stern at the Valley Vista staging area, across from Boundary Oak Golf Course, from 8 a.m. to noon Sunday, April 15. The hike will take in an elevation gain of 700 feet, which is nothing to sneeze at, especially if you have allergies. Moderate rain will cancel the event, organizers say. For information, call Harvey Ceaser, (925) 937-1406.