Blog Posts Archive - Page 24 of 138 - Golden Gate Bird Alliance

Young cormorant eating from bill of adult

Chow time for cormorant chicks

Photographer Rick Lewis, a Golden Gate Bird Alliance member, specializes in documenting the avian life near his Alameda home. Over the weekend he had a chance to watch young Double-crested Cormorants being fed by their parents in a nesting tree near a busy shopping center there. Here are two of the eagerly waiting chicks:

Double-crested Cormorants are the most numerous and widespread of our six North American cormorant species, and San Francisco Bay is one of their main nesting areas along the California coast. They lay an average of three or four eggs. The young don’t start flying until they’re five or six weeks old and they become fully independent around 10 weeks. In the meantime, someone needs to fetch them dinner, and it’s not DoorDash.

Adult male and female cormorants are indistinguishable, and they both feed the chicks through regurgitation. They catch and swallow fish until they’re full; then they return to the nest. The nestlings peck at a spot on their throat—the yellow gular pouch—which stimulates them to regurgitate the fish.

“The young Double-crested Cormorants need to coax the adult if they want food,” explained Rick Lewis. “It is only given after the proper ‘buttons’ are pushed repeatedly. Only then will the applicant be given entrance. It is an invasive process.”

Depending on how long it’s been since the fish were swallowed, they may have been digested into a slurry liquid or they may still be whole. Sometimes older nestlings remove an entire fish from the adult’s neck pouch.

The older or more aggressive nestlings get most access to food and have the best chance of surviving to adulthood. “Sometimes the other sibling simply waits its turn, other times it pesters both birds,” Lewis said. “The adults get tired after a while and turn away or move away entirely and take a nap.”

The feeding process can be messy! Ornithologists studying the diet of cormorants use the splattered remains of regurgitated meals to figure out what kinds of fish they’re eating. But bird barf isn’t just for feeding chicks. If threatened, both young and adult cormorants will regurgitate what they’ve eaten as a defense mechanism.

We’re fortunate to have so many Double-crested Cormorants around the Bay because of the environmental movement. The species faced a severe decline from the 1940s through the 1970s because of the pesticide DDT, which accumulated in the fish they ate and caused their eggshells to thin and break.…

Dragonfly Detour

By Tara McIntire

Over the course of this past year, our lives changed forever For me, this has translated into a “world exposed” as I discovered the natural wonders of tiny spiders and pollinators, during endless hours in my garden during the early months of our shelter-in-place. I liken it to a forced road detour, along which you find a new bakery, coffee shop, or potential birding site (maybe even a rare bird!) you would not have discovered otherwise.

Rising at dark o’clock to drive endless miles to a birding hotspot had ceased. Long virtual work weeks left me exhausted and sleep became the new weekend priority. As the health restrictions eased, I finally ventured beyond the safe confines of my fenced yard, though a bit later in the day than before the pandemic. My favorite bird sites were too crowded with people for my comfort level, so I sought out locations where I could be alone, immersed in nature, and focused on birding.

Briones Regional Park, a perfect example of a people-free nature immersion zone. Photo by Tara McIntire.

On one particular excursion, I was trying to find seemingly non-existent birds, when something caught my eye (and ears). “Zooooooooooom!” I looked around, wondering if it were a hummingbird, but instead spotted a little blur whizzing about the meadow. It was a dragonfly!

A green darner (Anax junius) zooming through the sky. Photo by Tara McIntire.

I am endlessly curious, so it’s not as if I hadn’t ever noticed them. I’ve been absolutely mesmerized by dragonflies since my childhood, which is evident in my photographs taken over the years. Unfortunately, I’d been reserving space in my brain to store 10,000 species of birds! Surely, there was no room for these magnificent creatures; thus I had allowed time for appreciation and no more.

It wasn’t just the pandemic that caused me to take a longer look at dragonflies. Other sparks of connection and bits of information influenced my explorations into yet another new world. As I soon discovered, there was indeed room in the noggin for more!

After that first “zoooooooom” in early summer, I paid closer attention to these winged wonders and once again refocused my camera lens. Immediately I noted that dragonflies were ]everywhere! I found them teeming at ponds and riparian areas, high on dry ridge tops, and even in my urban backyard.

Variegated meadowhawk (Sympetrum corruptum) in the author’s yard.…

Birdathon 2021: Soaring success

By Ilana DeBare

If Birdathon 2021 were a film, we’d say “it’s a wrap!”

Instead we’ll say, “it’s a rap-tor!”

Golden Gate Bird Alliance’s annual fundraiser came to a high-flying conclusion over the weekend, capping two months of innovative new events designed to carry on despite Covid.

Unable to hold our usual in-person Birdathon programs, our creative volunteers came up with three alternatives: a series of ten Virtual Field Trips via Zoom, a socially distanced Christmas-in-May Bird Count, and an online Birdathon Adventure Auction. They culminated with a Birdathon Virtual Celebration on Sunday night.

These new events were highly successful in all respects—number of participants, quality of the experiences, and funds raised. Here’s a flyover raptor’s-eye view of them all.

White-tailed Kite during the Oakland Christmas-in-May Bird Count, by Mark Rauzon

Virtual Field Trips

We sponsored ten Zoom “trips” that ranged from viewing Sage-Grouse in Lassen County to a pelagic journey to the Farallones. Over 400 people signed up and attended an average of two trips each. We raised $13,200, or more than $1,000 per trip.

Bonus: Video recordings of all the Virtual Field Trips are available, so you can watch any that you missed! View descriptions of the trips here. Then call our office at (510) 843-2222 to provide credit card payment of $15 per trip and get the link to the recording. The best time to call is on Mondays through Thursdays, from 10 a.m. to 1 p.m.

Christmas-in-May Bird Count

Over 140 people signed up for counts in Oakland and San Francisco that coincided with eBird’s Global Big Day on Saturday, May 8th. We managed to cover most of our regular Christmas Bird Count areas, and enjoyed sightings of breeding birds as well as balmy temperatures that aren’t available in December. Oakland count participants got to try out some new features—paperless reporting, using only eBird, plus new digital maps—that will prove useful in future Christmas Bird Counts.

Christmas-in-May Count at the Oakland Zoo / Photo courtesy of Mark Rauzon

Barn Owl during Christmas-in-May Bird Count by David Assmann

Registration fees generated a total of $3,260; one generous member covered fees for people who found them a challenge. Special thanks to count compilers Dawn Lemoine and Viviana Wolinsky (Oakland) and David Assmann and Siobhan Ruck (San Francisco) for creating this successful new event from scratch.

Birdathon Adventure Auction

The online auction, which closed Sunday night, brought in more than $15,000 for Golden Gate Bird Alliance’s conservation and education programs!…

Secret Jewel along Tomales Bay

By Ilana DeBare

Bay Area birdwatchers have long flocked to Audubon Canyon Ranch’s flagship Martin Griffin preserve along Bolinas Lagoon, which for years hosted dozens of egret nests.

But almost no local birders have set foot on another ACR property—its dramatic Toms Point preserve on the northern edge of Tomales Bay.

Toms Point is a 70-acre promontory near the mouth of the bay with striking views of Point Reyes and the largest intact dune ecosystem in this part of California. Protected by ACR since 1985, it’s normally off-limits to the public.

Now—through our online Birdathon Adventure Auction—Golden Gate Bird Alliance is offering an extremely rare guided tour of Toms Point led by the site’s former steward, Dan Gluesenkamp.

View of Toms Point / Photo by Dan Gluesenkamp

“Toms Point is a magical landscape, a promontory where cold Pacific winds meet the soil of North America, where ocean currents mix with the rich waters of Tomales Bay,” said Gluesenkamp, who spent a decade in the early 2000s as Director of Habitat Protection and Restoration for Audubon Canyon Ranch “You have the diversity of intact habitats, the feeling of the wind, the magic of the location…. Anyone who visits will understand how special this place is.”

Reaching Toms Point requires exiting Highway 1 for a dirt road and passing through a private cattle ranch and multiple locked gates. The last gate opens onto ungrazed land—primeval scrub land blasted by sea winds.

The site contains a surprisingly large number of distinct habitats, from coastal sand dunes with rare dune annuals, to salt marsh and grasslands. The San Andreas Fault crosses the property, with each side holding a different ecosystem. The eastern side of the fault is sandstone with invasive grasses; the western side is unconsolidated marine sediments that support California native grasses.

“It’s a Disneyland of different habitat types,” Gluesenkamp said. “Like stepping from Tomorrowland into Frontierland, you can step from one habitat to another.”

Aerial view of Toms Point showing various habitats—dunes, marsh, grasslands / Courtesy of Dan Gluesenkamp

Ephemeral dune wildflowers, including Cammasonia and rare Gilia

Coastal scrub habitat at Tom’s Point / Photo by Dan Gluesenkamp

There are no structures on Toms Point, not even a toolshed or restroom. Its open grasslands often bring sightings of Grasshopper Sparrow, White-tailed Kite, Northern Harrier, and Western Meadowlark, while the Tomales Bay shoreline offers loons, grebes, cormorants, and Baird’s and Pectoral Sandpipers.

Gluesenkamp’s personal expertise is plants—he’s the former Executive Director of California Native Plant Society, and currently the executive director of the California Institute for Biodiversity—and he easily identifies native wildflowers such as popcorn flower (Plagiobothrys) and beach starwort (Stellaria littoralis). …

Creation of a felted Osprey chick

By Hilary Powers

Bid high for the baby Osprey in the Birdathon auction – you may never see another!

When Golden Gate Bird Alliance called for donations of services or experiences (not stuff) to fit this year’s theme, I had to stop and think, because stuff is what I do: true-life replicas of creatures natural or imaginary, captured in wool and beeswax and steel.

1: A few felted friends. Photo by Hilary Powers

So how about a choose-your-own baby bird? That’d be an experience, I wrote, and we could set the prize to track the winning bid, starting with a duckling and offering bigger (or more) birds the higher the bidding went. As long as the winner selected a nestling at the downy stage, I figured all choices would be equal. More fool I….

Why specify a baby? Adult birds have feathers. And feathers are living miracles. With my skills and goals, long feathers are insanely difficult to get right. But I’d spent countless hours editing with nestcams on a second screen, and I’d already built a duckling, an owlet, a few eyases, and even a California Condor. So I (thought I) knew: baby bird = fluffy coat, likely all or mostly one color, probably white = something wool would do easily.

After pouncing on the idea, the GGBA folks came back and asked if I could make an Osprey for them instead, as that would fit in with their live Osprey nest cam along the Richmond shoreline. Sure, sez I, choose-your-own was just a way for stuff to masquerade as experience.

Then I started looking at Osprey nestling pics. Oops. Unlike falcons and owls and hawks and eagles and condors, baby Ospreys are never white and fluffy. Ospreys hatch as little dinosaurs and stay saurian until their body plumage comes in, along with all those lovely, complex flight feathers.

But yes had been said, and a challenge has its own delights.

Work started March 12 with research: collecting dozens of images (many from Golden Gate Bird Alliance’s webcam videos) and reading up on development. When do pinfeathers start? Way too soon. What’s the eye color? Depends on the day; blue at first but turning blood red after “a few days” (how many, nobody says). What’s the length, beak to tail? Again, depends on the day; happily I found a pic where someone had set a ruler inside a nest of chicks about the right age.…