Mayhew 1950 Mallard 23. March 12 Conaway Ranch, 2 miles east of Woodland, Yolo Co., Calif. 2 of the ♂ circling back over the area + Flying off to the north. The lone ♂ disappeared to the south. While driving along the eastern edge of section 20, I flushed 4 pairs of birds. The 2 nd pair was about 300 yards north of the 1st, the 3 rd pair about 150 yards north of the 2 nd, + the 4 th pair about 100 yards north of the 3 rd. At no time today did I see any large flock of this species. April 2 Practically all pairs are found on territories now. I spent the day counting breeding pairs in the southwest corner of the ranch. The boundaries of the area covered were: the south + west boundaries of the ranch, the main canal on the east, + Gallup Road on the north (road just south of ranch headquarters). All the ditches were covered, except 3 that will be walked in a day or two. 76 breeding pairs were counted in this area. Of that number, 4 times I saw 1 ♂ with 2 ♀, but in each case it appeared that the ♂ was mating to one of the ♀, the other ♀ just seemed to be tagging along. Twice I saw a pair of ♂ together, once I saw 3 ♂ together, but at no time did I see any sign of mallards grouping together. The