1915 List of birds at Bolinas (Apr. 16-19) Ducks - abundant - but difficult to distinguish species. Mergansers - flock of 6-8 - near Beach toward Willow Camp Mallard - on Lagoon - Blue bills - Lesser Scaup - White-winged Scoter Geese - at upper end of lagoon Great Blue Heron - one on lagoon (Apr.18) as I returned from Willow Camp. One on lagoon as we returned on Fort Baker Road (Apr. 19) Coot - Mud Hen - on lagoon - Red-backed Sandpipers on lagoon flock of 18-20. Snowy Plovers - four - two pairs along shore of lagoon as I returned from Willow Camp - First pair flew with cry as if flushed 2nd " ran ahead of me.