Field Notes Doug Bell Location: Alcatraz I., SF Bay, Calif. DATE: May 1, 1987 TIME: 9:15- Weather: rained last night. Clear, but scattered clouds. Moderate wind. Tide: low, 1.5 m of rock exposed. At blind on eastern recording. Pairs on Territories 23 + 10 copulated. 9:42 - 22 birds in perimeter, 6 on platform Count. feed by pair 32 seen - fish chunks. Note: as I walked up to blind saw 3 diff gulls looking for nest material. As I was recording from 9:15-9:45 saw at least 4 diff. birds carrying nest material. Pair 30 came in twice with nest material. 9:44 - [illegible] 9:54 watching colony... fight on TB at 9:53 at end of colony watch 9:54 29 gulls in perimeter; 9 on platform 9:57- watch pair 32 - after male mewed a lined & to nest, a commotion from an flight caused B to fly over to see what was going on. 10:01 pair 20 copulating; 10:03 copul. of pair 20 over. The role began w/ high pitched clucks, ? was quiet. Occasional head toss. Then B went over to lower pitched choking clucks. ~~ 10:08 - 32 gulls in perimeter, 8 on platform 10:08-10:18 watching colony. 10:16 pair copulating on west cliff. 10:19 Pair 7 - both first involved in a boundary dispute - stand off, then this ended after ca. 2 min... 10:21 on both both birds just standing on territory. 10:28 - flying bird carrying nest material. 10:29 - pair 10 - male seen carrying huge chunk of grass in to nest. 10:33 pair 31 seen to steal grass from nest of pair 30. 10:43 pair 31 repeated grass steal from nest of pair 30. Pair 10 copulated, 10:47 watching colony 36 gulls on perimeter, 6 on platform. Copulation: under water tower & on metal pile. 10:59 - observing pair 20. One bird on nest, the other standing on territory. Strange - at first I thought the one bird standing was mate of the sitting bird. It walked over to it, after it had regurgitated and swallowed