Have you spotted black oystercatchers when visiting your West Coast national marine sanctuaries?
Oystercatchers often are heard before they are seen. Their loud whistling wheep-wheep is shrill and carries above the sound of the surf. At low tide, these large shorebirds can be spotted foraging for mussels and other shellfish. These two were photographed in Greater Farallones National Marine Sanctuary.
(Photo: Beach Watch/NOAA)