FIELD NOTES DONG BELL LOCATION: Alcatraz I., SF Bay Weather: -wind picking up DATE: May 2, 1987- cont Time: 11:33 11:33- Copulation on IB. 33 birds on perimeter, 11 on platform. 11:36- 9*32 long called to 5, as he approached, she then moved to [illegible] him. An intruder landed on platform, first, 3 came over in agg. up, bypassing pair 27 choking, then males 32 & 26 came over in uprights to force intruder away. 11:39 another gull seen carrying nest material. Recorded copulation by pair 30 -> 2 food transfers seen- pair 33 was of fish, pair 32 of garbage. 11:48 copulation on IB rods. 12:38- Pairs 12 + 5 copulating. 12:44- pair 31 count feed - fish 14:38- Colony, 26 on perimeter, 12 on platform (gulls, that is) 14:41- Copulation on metal runs.