Walk among the Ohlone Indian grounds and shell mounds looking for northern harriers, great horned owls, rare rough legged hawks and pygmy owls.  Also seeing many marsh & shore birds, ducks, yellowthroats, meadowlarks, hermit thrushes, and rare black & white warblers.   Leave at 8:00 am from the Wild Birds Unlimited parking lot returning approximately 2 pm.  Carpooling encouraged.  Parking $5.00.  Wear layers and bring lunch.  Leader: Kevin Hintsa,  925-798-0303. Category 2. Donations to MDAS encouraged.