With spring migration coming to an end, we’ll be looking out for late migrants, including passing loons, shorebirds and scarcer passerines.  As usual, the weather will dictate our focus with onshore northwest winds ideal for spring sea watches, while offshore easterly winds promise a good selection of passerine migrants even at this late date. Join us for a Sea Watch at 7:30 AM or arrive later at 8:15 AM for a circuit of the lagoon. A brief mid-morning ‘coffee-stop’ is planned at the Headlands Center for the Arts. Your contribution for coffee via the onsite “tip-jar” would be appreciated. This field trip is less suitable for beginners.
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Species we hope to see might be, Ash-throated Flycatcher, Hooded Oriole, Cassin's Viero, Hutton's Vireo, Western Warbling Vireo, Western Tanager, Black-headed Grosbeak, a calling Pileated Woodpecker and resident species.
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De Silva Island is home to a long-established colony of Great Blue Herons, residing in a grove of eucalyptus trees on the banks of Belloch's Lagoon (Strawberry Cove) in Richardson Bay. In recent years Great Egrets and Double Crested Cormorants (colonial nesting species) have moved into this fine breeding site.
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Thursday, June 4, 2026 8:30 AM to noon Birding with Mark Clark Registration is not required. All participants are welcome to join this trip. We welcome bird enthusiasts of all levels, especially beginning birders, to join leader Mark Clark on our monthly walk around the ponds at Las Gallinas.  On our search we’ll be looking for waterfowl, waders, songbirds, raptors 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. DIRECTIONS: From Hwy 101, exit at Smith Ranch Rd. Drive east on Smith Ranch Rd. toward McInnis Park. Turn left immediately 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 restroon in the parking area for public use.

Marin Audubon Hosts Field Trips for California Bird Atlas BIG WEEKEND. California Bird Atlas Big Weekend is a four-day statewide celebration of birds and the new California Bird Atlas – featuring dozens of field trips, and a collective mission to document as many species breeding in as many blocks as possible. Field trips introduce Atlas basics in the field, with leaders showing how to contribute. The goal is to make it easy for first-time participants to get involved and continue contributing beyond the weekend. Marin Audubon is sponsoring the following field trip for the CBA Big Weekend: Rodeo Lagoon, Marin Headlands Friday, June 5, 2026 7:30 AM to 12:00 PM Birding with William Legge and David Wiechers REGISTER HERE Registration is required for this trip. Registration opens on Tuesday, May 26 at 8AM Limit of 15 participants for this trip. The primary focus of this Field Trip will be seeking out and documenting breeding birds for the California Bird Atlas (CBA). Join us for a Sea Watch at 7:30 AM or arrive later at 8:00 AM for an expanded circuit of the lagoon to include trails that are rarely birded. DIRECTIONS: On Hwy 101 and take the last Sausalito exit just before the Golden Gate Bridge. At the exit stop sign, turn right and go under the freeway, then follow the road down to the left. Turn left at the sign to the Marin Headland. Proceed on Bunker Road to the Rodeo Lagoon Parking Lot and meet at 7:30 by the bridge over the channel to the beach.

Marin Audubon Hosts Field Trips for California Bird Atlas BIG WEEKEND. California Bird Atlas Big Weekend is a four-day statewide celebration of birds and the new California Bird Atlas – featuring dozens of field trips, and a collective mission to document as many species breeding in as many blocks as possible. Field trips introduce Atlas basics in the field, with leaders showing how to contribute. The goal is to make it easy for first-time participants to get involved and continue contributing beyond the weekend. Marin Audubon is sponsoring the following field trip for the CBA Big Weekend: San Geronimo Community Center environs Friday, June 5, 2026 9:00 AM-12:00 PM Birding with Liz Lewis and Susan Kelly REGISTER HERE Registration is required for this trip. Registration opens on Tuesday, May 26 at 8 AM Limit of 14 participants for this trip. On this trip we will be introducing the CBA and the breeding codes to those who are new to the Atlas. All experience levels are welcome for this easy, three miles roundtrip. We will meet in the parking lot of the former San Geronimo Golf Club now offices of Marin County Fire. There is a porta potty in the parking lot. We will hike the paths and grounds of the former golf course.