PROGRAMFULL. NO MORE RSVPs. Saturday, February 27, 2010, 4:00 p.m.-7:00 p.m.: Muir Woods marks the southern front in a battle for survival between two competing owl species. On this strenuous seven-mile dusk hike we will look and listen for the owls that make Muir Woods their home, learn more about their history and ecology, and receive the latest research updates on our most famous resident, the spotted owl, which is defending its habitat from the invading barred owl. Dress in layers and bring a flashlight, water, and snack. Heavy and/or slanting (high winded) rain cancels the trip. Meet at Muir Woods National Monument Visitor Center. Park entrances fees apply and $3 material fee requested. Group limit is 25. Reservations required, 415-388-2596. If you need to cancel, please call to cancel, so that waitlisted people can attend.