Fulica americana -122- Lake Temescal, 420 ft., Oakland, Alameda Co., Calif. Brownier plumage than of the summer. Territory play was in full play specifically, but there was no harassing of the mallards; in fact the costs seemed to make an effort to keep out of the Mallards' way. Several territory disputes were observed, once with a ring of immature birds gathered in an open circle about the 2 adults in paired display. That is until another adult came in and attacked a couple of immatures on the wrong side of the line. The boundaries seem to still be about as I judged them to be earlier this year. Pairs are still together, and one adult bird was observed carrying a long piece of cat-tail material into the cat-tails at the S end. Jewel Lake, 500 ft., Tibben Park, Contra Costa Co., Calif. At the lake this afternoon, about 3:30 p.m. one dark headed but gray-billed bird came out at about G12- feeding on Potamogeton -a moment later it suddenly scrambled under into surface, raising wings and feet to get through the pondweed.-A moment later an Accipiter (probably large Sharp-shin) made a pass at where it was and then moved S down the lake. About 15 to 20 seconds later the cost came up at about H12.18 (underwater from about F11.13), and kept its body close on the water, its head and neck pulled in, and its tail vertical but not with the coverts spread. Several times it ducked its head and neck under-water, but finally decided it was safe and ceased to behave that way. For quite a few-