1948 Oxyura jamaicensis 1 Nov. 5 N. of E. end of Oakland Bay Bridge, Alameda Co., Caly Many (several hundred at least) seen from Eastshore Highway from near Berkeley Pier to base of Bay Bridge (only a few there). None were seen among huge flocks of other diving ducks further out in bay. 1949 June 26. El Estero Park, Monterey, Monterey Co., Calif. 11:25 a 4 49 seen on this park pond with bits of tule border a good tule a willow island. The 3?s were in brilliant plumage with bills practically luminescent they were so blue. One ? was seen rushing at a ? with her wings somewhat outspread. At her approach he would dive a reappear 15 - 20 feet away, whereupon she re- peated the manuevers (which seemed to be amorous rather than antagonistic). The first time we saw this the ? went thru the typical courtin display with head bobbing a bill dipping into the water when he surfaced — but this was not repeated when she chased him under, th succeeding 6 or 7 times, after which he swam away a the affair ended. However, their actions attracted 6 other males from all directions around that arm (N.arm) of the pond. They swam rapidly in toward the ? ; but none approached her closer than 15 ft. or no nuptials display on their part. [No young here, the mallards had plenty out]