Along the west shore of Richardson Bay, Bothin Marsh is an example of what the wetlands surrounding San Francisco Bay and San Pablo Bay looked like before they were channeled, diked, and filled. During fall and winter, migratory waterfowl thrive in the open water and sandpipers and other shorebirds feast on the invertebrates that are found in the mudflats. We’ll also look and listen for year-round residents like clapper rails and common yellowthroats, which inhabit the surrounding cordgrass and pickleweed. This walk is free of charge, no registration is necessary. This walk is for adults. We request that no animals (except service animals) attend. David Herlocker will lead. Questions: Contact David at (415) 893-9508 or DHerlocker@marincounty.org. Rain may cancel: Call (415) 893-9527 after 7am on the morning of the event to hear a recorded message if cancelled. Meet at the end of Sycamore Ave in Mill Valley.