In November 1989, Audubon Canyon Ranch (ACR) began an ongoing program to monitor seasonal populations of shorebirds (Scolopacidae and Charadriidae) on Tomales Bay. Three baywide counts, treated as replicates, are completed within each Nov.-Dec. and Jan.-Feb. census period, to estimate early winter and late winter population levels, respectively. An additional baywide count is conducted each August and April in an attempt to record peak numbers of fall and spring migrants.

Shorebird monitoring program on Tomales Bay, California