This observation is for the bird on the right, with the black around the eye and the greenish yellow bill, western grebe. (Bird on the left is Clark's grebe.) Paired with and same photo as https://www.inaturalist.org/observations/37502693. Arrowhead Marsh & New Marsh, Martin Luther King Jr. Regional Shoreline EBRPD. Golden Gate Audubon field trip. King Tide at 11:45am