R.E. Johnson 1968 Pied-billed Grebe Nov. 30 Berkeley Aquatic Park, Alameda Co., Calif. Overcast, occasional rain. Group of 6 swimming in loose group, not diving synchronously, but foraging within 100 ft of each other. Usually submerge head first in dive but sometimes just sink feet 1st & head last as if sinking in quick sand. Occasionally also only surface so head (not neck) appears above water.