The 2020 Black Oystercatcher Survey has been completed. This summary is for year nine of a ten-year survey that is overseen by Audubon California and sponsored by Morro Coast Audubon Society and California State Parks (more acknowledgements on pgs 22-23).
Summary Report: https://drive.google.com/.../1ZxnqHtZXuSy44AsgJG2lap.../view?
