Mayhew 1949 July 26 Conaway Ranch, 2 miles east of Woodland, Yolo Co., Calif. has already been harvested. The cover on the rice levers on this 160 acre plot consisted mostly of volunteer sudan grass which averaged about 3 feet in height. There were no broods found in this plot, although 3 of the & acted as though they had a nest or young nearby. However, the cover was so thick each time that I was unable to uncover a nest or to scare out any young. The total of 18 ducks on the 160 acres adds up to 0.1 duck per acre, or about 1 duck for every 8.9 acres. Adding the two plots together, that would be 29 ducks seen on 320 acres, or an average of 0.09 ducks per acre. This would average 1 duck for every 11 acres of rice. With approximately 5,000 acres of rice on the Conaway, the number of mallards, judging from this census, should be about 450 ducks. I don't understand what has happened, because I saw more adults than that before nesting had really gotten underway. However, I'm not very surprised at the results, because I have been finding approximately this number of ducks in covering other rice areas since June 23rd when the grain harvest finished. At that time the reduction in the number of ducks in the area was quite evident, & has remained so. I thought all along that the ducks had moved to some