Field Notes D.A. Bell 28 March 1990 At Battery Spencer, 3rd lowest bunker, closest to Golden Gate Bridge, Marin Headlands, Marin Co., California. 10:55. Observing Peregrine Falcon eyrie from lowest bunker, looking through west-facing windows of bunker, at east-facing cliff of little cove just W of Golden Gate Bridge. The cove is formed by steep slopes dropping off precipitously from Battery Spencer. Most of the slopes (W+E) are loose rocky, strewn with eroded crevasses and having steep faces interspersed. The eyrie itself is on a relatively sheer face that rises up from the water about 130 feet. The eyrie is on an old raven nest, about 30 feet below the crest of the cliff face, in an overhang crevasse. One has a good view of the nest from the bunker, when angling the scope down about 45°. Can look right into the nest! Water grassy shelf sheer walls overhang eyrie Battery at this level, ca. 400' above water