Fulica Americana Apr 8, Lake Temescal, 42 ft., Alameda Co., Calif. - The flock, 5 birds, is feeding at N37. There are two birds (N pair ?) with swollen frontal shields and 3 (including SR) without. 1 cock at H2 is being chased still further up the inlet. W, SW, SE, M and E pair all on territory. Also a pair in the swimming area at the NE end of the lake. And a chase across that area was just now observed. The chased bird going from the outer most platform towards E 35. Neither bird of the W pair seems to have a really big shield. Some crowing at the S end just heard. The F setting at J6.5 (1:45 p.m.) remains in place when the O chases an invader out by the nest, but she gives a low poonk-poonk-poonk. The bird on the nest gave a low punk-unk-uk, punk-unk-uk as a marked Mallard drake fed within 2 feet of the nest, but she made no attempt to leave the nest to defend it. If I have yet to see any aggression against any of the ducks at this year. Two birds just crossed from E/4 to feed at M11. As I approached some cat-tail where the male couldn't see me, the ♀ that could, gave a low "punk-unk" until the O took notice