Three adults observed.
At Duck Cove.
2" wide on my front door
Limatour beach, point reyes
Bat rays swim into the channel beneath the foot bridge to Indian Beach in Tomales Bay State Park - along the path from Heart's Desire Beach. The channel is only about 5 feet wide, so they are easy to see there.
Least sandpiper in second photo for comparison.
Several dozen seen on the sands of north north of lagoon.
Taken by one of my campers.