Join us for a day of seabird and marine mammal watching as we head out to the Farallon Islands and offshore waters. Naturalist David Wimpfheimer will be our guide aboard Captain Christian’s power catamaran, Outer Limits. When we last did this cruise, sightings included Humpback Whales, Laysan and Black-footed Albatross, Tufted Puffin, Rhinoceros and Cassin’s Auklets, shearwaters and jaegers. We will get a close-up look at the islands and hear about their interesting natural and human history. This is a trip that both experienced and first-time birders and nature lovers enjoy.

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Join William and David for this third fall migration field trip at Rodeo Lagoon. This is their long-time “patch,” which never seems to disappoint birders with daily variations in species and a good chance of an unusual sighting. On this trip, our group will be targeting Parasitic Jaeger, migrating shorebirds and scarcer migrant passerines. We will begin the morning with a Sea Watch from Rodeo Beach at 7:30 AM. Those arriving later may join us at 8:00 AM for a circuit of the lagoon. READ MORE

Join other MAS members for an evening opportunity to witness Vaux’s Swifts during their fall migration through Marin, which occurs in September and October. Dan McNear of McNear Brick & Block has kindly allowed Marin Audubon to access this remarkable site where decommissioned smokestacks provide an important communal roosting place for the swifts.
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Join avian ecologist David Lumpkin, for a field trip to his work location, All Hands Ecology’s (formerly known as Audubon Canyon Ranch) Cypress Grove Research Center. All levels of birding enthusiasts are welcome on this easy two-mile walk.

Sightings on our walk to and along Tomales Bay at this time of year may include ocean birds if conditions are right, the occasional vagrant passerine, and an influx of interior breeders not seen in the summer. Other migrating shorebirds may be seen as well as the usual mix of coastal prairie species. Rain does not cancel.
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Thursday, October 1, 2026 8:30 AM to noon Birding with Mark Clark Registration is not required. All participants are welcome to join this trip. On this trip we especially welcome beginning birders to join Mark Clark, along with bird enthusiasts of all levels, on our monthly walk around the ponds at Las Gallinas.  With fall migration underway, we’ll be looking for waterfowl, waders, songbirds, raptors, rails and swallows. We are likely to spot some interesting species, so come assist in our search. The packed dirt paths around the ponds are wide, flat and easy to navigate. Heavy rain cancels. There is a portable restroom in the parking area for public use. DIRECTIONS: From Hwy 101, exit at Smith Ranch Rd. Drive east on Smith Ranch Rd. toward McInnis Park. Turn left after crossing the railroad tracks and drive about 0.5 mile through the LGVSD gates and into the parking lot at the end of the road. Meet the group by the bridge just past the parking lot. There is a portable restroom in the parking area for public use.

Join us on our walk along Deer Island Open Space trails with iNaturalist Ambassador Sarah Reid, who has experience with California Academy of Sciences, Sonoma Land Trust and Regional Parks.  Her goal is to support new and existing users of the iNaturalist platform in learning how to record, identify and explore biodiversity in their local regions. READ MORE

Join William and David for this fourth fall migration field trip at Rodeo Lagoon. This is their long-time “patch,” which never seems to disappoint birders with daily variations in species and a good chance of an unusual sighting. On this trip, our group will be targeting Parasitic Jaeger, migrating shorebirds and scarcer migrant passerines. We will begin the morning with a Sea Watch from Rodeo Beach at 7:30 AM. Those arriving later may join us at 8:00 AM for a circuit of the lagoon. This field trip is less suitable for beginners.  READ MORE