Because the beaver isn't just an animal; it's an ecosystem!

Category: New Species


Look who was visiting the primary dam this morning! Fishing all around the tangled flow device with his greedy appetite. It’s been a good long while since I have seen cormorants that high up in the creek. I remember the eager one when staff first lowered the dam a million (pre-flowdevice) years ago. He came right in the middle of the crowd of workers, determined to be the only mouth at the damside when all those fish were pushed to the drain.

This morning was a foggy, peaceful, and beaver-less visit. I don’t know if I was too early or too late to catch the show, but several people assured me they had been there in the dark. I strolled down to check out the woodduck boxes, and stopped to listen for frogs. The third dam is looking fairly repaired, although the fourth is entirely gone. The damlet and canal were in stark relief because of the nicely low tide. There were plenty of cooperative beaver footprints in view.

Yesterday Jon tried something new to protect the chewed trees at the primary dam. Sand-painting. It has been recommended that painting the trunks with sand discourages beaver nibbling as they dislike the gritty texture. The paint is non-toxic and won’t harm them even if they persevere. We’ll see what happens. He had wire-wrapped them after the new year’s feeding frenzy but the wire disappeared,(whether by overly fastidious staff or beaver-defenders of grand compassion we couldn’t say). The sand isn’t likely to go anywhere, and as the color is matched to the trunk it shouldn’t be a problem for the city.

The year’s at the spring,
And day’s at the morn;
Morning’s at seven;
The hill-side’s dew-pearl’d;
The lark’s on the wing;
The snail’s on the thorn;
God’s in His heaven—
All’s right with the world!

Robert Browning: Pippa Passes


I was getting ready to announce Worth A Dam’s presence at the Flyway Festival the 6th and 7th, when two very fine events coincided to assist. The first is that we had a fantastic new bird visitor at the damlet site yesterday, caught by Cheryl here:

Clearly there is going to be a housing boom. This is a common merganser. Avid beaver fans will remember that a hooded merganser was filmed at the primary dam last February, so its obviously the time for visitors. Like wooduck, these birds are what’s known as “obligate cavity nesters” which means they lay their eggs in holes they cannot dig themselves. (“much obliged!”) And bird boxes. Like the one Mitchell installed three days ago. Cheryl saw him check out the area up stream and downstream. Expect to see more of this pointed face!

Today I noticed a little surge of activity on the webpage and went to see where it was from. I discovered that the Flyway Festival has put our information and program on the schedule!

1:30pm – 2:00pm

Why Beavers are Worth A Dam

Slide show presented by Heidi Perryman, Ph.D.
The Martinez Beavers have been the center of controversy, environmental growth, and community action since 2007. This presentation will use footage and stills from a collection of local photographers to show the beavers’ unique impact on the habitat, including birds and other wildlife. It will outline tools used by the city to manage their continued presence. Heidi Perryman is a child psychologist who became an accidental beaver advocate when the family moved into the urban creek near her home. She began filming the beavers and writing articles for the local paper. Eventually serving on the “beaver subcommittee”, she formed the group Worth A Dam (associated with the 501.3 (c) Land for Urban Wildlife) to advocate for their continued care and teach others about the value of this Keystone Species. Learn more at www.martinezbeavers.org/wordpress Join an artist from their team for a kid’s “beaver art” project on Saturday at the Wildlife Expo.

The entire roster of events is dazzling. They get 7500 people in a weekend. This is the BIG BIG BIG bird and watershed event of the year. And it is safe to say, in the history of the known world, they have never had a beaver display before. How exciting is that? Getting thousands of avid birders interested in the relationship between beaver dams and birds, and talking about the resources for beaver management? I can’t think of a better investment of a weekend. Come by and say hi and help us with our “build a banner” amazing art project!


Available Immediately: One Room loft, creek front property, no previous owner and no downpayment required. Quiet downtown area with immediate access to public transportation and waterways. Close to schools and parks. This is a dream place to raise your feathered family! Famous neighbors a bonus. Call or come see for yourself!

Thanks to Eagle Scout candidate Mitchell Maisel, Wooduck expert Sandy Ferreira, and Installation Devotee Brian Murphy for making this all possible! I can’t wait to see what comes next!


Our VP Cheryl has been hard at (lovingly unpaid) work at IBRRC this weekend taking care of a peck of pelicans who have been adversely affected by all the runoff pollution in their water. It is hard, unforgiving work. These birds are nearly as tall as she is, and their beak can function as prodigious bayonet. Still the white pelican is one of Cheryl’s favorite birds in all the world, so she was happy to send this photo of a recovering patient:

Photo: Cheryl Reynolds

A marvelous bird is the pelican

His beak can hold more than his belly can.

He can store in his beak

Enough food for a week

But don’t ask me just how the hell ‘e can.

Dixon Lanire Merrith (1910)


So I sent Cheryl’s lovely photo to Lisa Ownes Viani yesterday and she sent it around to her fish buddies, Bruce Herbold, Ph.D. and Robert Leidy. Ph.D. of the EPA. They got out their detective skills and set about counting fins.

well, Rob Leidy and I both think that it is probably a tule perch.  We both also first thought that it was probably some sunfish, but magnification clearly shows the line of scales along the dorsal fin that make it an Embiotocid rather than a Centrarchid and the absence of barring on teh body and the fact that it is in or near fresh water would make it most likely the tule perch Hysterocarpus traskii.

Bruce went onto say that a tule perch was his favorite because of its unique reproduction. Mom bears all the young live! That sounded pretty wild to me, but after learning that our snipe engage in joint custody arrangements, anything was possible. The UCB California Fish Website had this to say about tule motherhood:

Young perch then begin to develop within her, slowly at first, and more rapidly in the final two months. In around May or June the female bears 10-60 live fish. The number of young produced increases with body size and may vary from one environment to another.

It also pointed out that these perch require “cool well-oxgenated water”, a description that many beaver-phobic biologists have warned would never happen because of the beaver dams. But my favorite message came from Robert Leidy, who added this little tidbit:

By the way, I think this is the first record for tule perch from Alhambra Creek, as I am not aware of any historical collections or records!

The keystone beaver strikes again! Let’s just take a moment to enjoy the series of connections necessary for this to happen. Cheryl took the photo because she was out watching for the beavers. I sent the photo to Lisa because I met her through the beavers. Lisa sent the photo on to the top fish biologists in the state who worked to agree on its identification. Robert recognized it was a first sighting. And our wikipedia friend immediately recorded the find on the Alhambra Creek pages.

That’s what I call successful cooperation! And the beavers get the credit for it, which they genuinely deserve. Keep your eyes out for new species down at the dam! A team of experts is standing by….

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