FIELD NOTES Doug Bell July 11, 1986 12:20 - Alcatraz I., SF Bay. Weather - clear sunny, wind ↑. 2 pairs of gulls on the cistern are apparently "chickless" but are going through extensive choking, long calling, sitting side by side, meowing, courtship feeding. View from blind: cement cistern N ↑ pairs establishing territories? nest: 3 chicks bush nest, chicks scrub burk grass nest: incub. bird July 12, 1986 10:50 : Alcatraz I., S.F. Bay, Calif. Weather - clear, but high fog over Golden Gate. Sunny, cool in shade. Windy - moderate. In blind with Maren - view over cistern, industry building Most chicks about 3-4 weeks old. Some younger, some older. Behind rock 32 a couple chicks are practicing flying on the strong wind: flap, bowyed up 1-1½ m, then back down to the ground. Heavy legging from the chicks. The two pairs that were seen "in new territories" yesterday are not there now. 10:58 - Adults doing frequent long calling, 2 pair also meowing. Combat - one adult of 3 chick nest on close right corner stooped on a lone adult sitting on cistern. Dropped swiftly on it, gripping bill, tussel ensued. Finally, the attacked bird got