Field Notes Doug Be 11 LOCATION: Alcatraz I., SF. Co., CA. DATE: April 5, 1987 TIME: 10:24- WEATHER: Clear, sunny. Light wind only TIDE: Low (half). One yard of rock is opposed. 10:31 Watching from blind on cistern. Pair on platform 27 moved after doing standoff with other bird. Wind picking up now - getting moderate. While watching colony seven military helicopters flew by the island - causing alerts in all birds, long calling, and some chases. 10:46 - Watching pair 9 at end of cistern. Both birds sitting on ground, resting. One has head tucked, other is looking about. 10:48 - Saw. landed on cistern, sat for less than a minute, then flew off; The pair 9 male stood up after another pair long called when its mate showed up. Then a "stranger" landed nearby, the pair 9 male charged it. 10:51 - male of pair 9 sat down, both birds resting again. Also - a 3 yr. bird landed on the platform, flew off at 10:54; Second yr. bird tried to land, but was chased off. The male of pair 9 has a dk. blotch on left cheek. 10:56 - both birds resting when doc ended. 10:57 Watching colony: pair 5 copulating: only we close contact after about 1 minute. 11:07 - Watching pair F: both present at start, female head-tossed to male, then male walked over to nest spot. Both birds then left the territory. Other birds: 6 Mallards 1 G "" 1 Turnstone W. Grebes (but fewer than before) White-crowns Bik.crn'd. Night Heron at Fort Mason: Hooded Oriole: g, brilliant, orange crown, apex, black back, bib, black back, white shoulder bar, blueish thige to bill, repetitively going "eek" 11:18 - Watching colony: wind good 21 birds on perimeter, 12 on platform. 11:30 - watching pair on platform. 11:32 male flew off - (her silver/ark land. F still on platform. Bird 2 appears to fought to other females on platform. 11:35 - watched a long call between a landing bird & a standing one, the standing one then chowed the new arrival away. so [11:36: F w/next material arrived on platform - just standing there). 11:40 checking colony for nests: 10 nests on the immediate study area, no eggs. Saw 1 cormorant feed -> small fish.