108 + Presidio of S.F. Hooded Oriole 2 - ? building nest next to nest apparently from which one brood already fledged Mockingbird Cedar Waxwing Pygmy Nuthatch House Sparrow Starling White-crowned Sparrow Alice Eastwood Camp, Muir Woods Nat.Mon 1930 - 2200 clear to foggy, calm, warm western Flycatcher 5 Violet-green Swallow 1-h.o Mary Louise Rosegay, Alan + Bettie Pistorius, Scrub Jay 2-h.o Don Robertson, Bonnie Bowen, Gary Zamzow, Common Raven 3 Danny Boelter, Bill Principe, Walt Koenig, Common Crow 2-h.o Marc Chamberlain, Pete + Lois Myers, Corey+ Chestnut-backed Chickadee 2-h.o Nadine Goodman Common Bushtit 2-ho Wrentit 4-ho Robin 4 Hermit Thrush 6 - singing - they breed here Purple Finch 2 Pine Siskin 5-h.o Rufous-sided Towhee 2-ho Spotted Owl "" 3 glimpsed as it flew overhead. Mrs. Rosegay led us to a known nesting site where we waited until dark in hopes of seeing them fly in but no luck. At 2100 I began doing my imitations and within 15 minutes we had two birds right above us. One was hooting and the other gave a curious rising whistle, like Peterson record. When the birds first arrived, the hooter (??) gave a 4-noted hoot: hooooo (1sec) hoo - hoo (1sec) hooo000000 This was given several times, and I gave the same calls back to him. After 4-5 repetitions, he began a more rapid rising crescendo of hoots, speeding up at end. Never finished a series of hoots without breaking the sequence abruptly with some low notes. We had both birds calling at us and answering us for 15 minutes. Never came closer than 75-100 feet although they were obviously excited. We saw both birds as they flew overhead - only silhouettes_ + roads western Gull Forster's Tern