Muir Woods marks the southern front in a battle for survival between two competing owl species. On this strenuous five-mile-dusk hike we will look and listen for the owls that call Muir Woods home. Learn more about their history and ecology, and receive the latest research updates on our most famous resident, the northern spotted owl. Find out how the barred owl emerged as a potent new threat in our own back yard. Meet Docent Steffen at the Visitor Center. No dogs. Bring flashlight, water, snack and dress in layers. Must be able to walk briskly up a steep hill. $3 optional material fee.

Reservations required, (415) 388-2596.