Western toad painting by Carl Dennis Buell

Birding and other pleasures and aggravations, in Berkeley and beyond, by Ron Sullivan.

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April 28, 2008

Wild Trees,

on the other hand, can do what they want and they look gorgeous whatever they do.

Twistsycamore.JPG

The sycamores in Sunol Park, a bit southeast of us, have this broomish tendency. Their leafy twigs burst out in asterisk explosions, and, as you might guess, leaf out late. The grass there is turning brown already. The sycamores (as sycamores typically do) grow along the creek, which runs pretty much year-round so they have a steady water supply, unlike the grass. They (as sycamores typically do) grow a fine crop of holes, so they house lots of birds: woodpeckers, bluebirds, owls, wrens, titmice, chickadees, swallows, more. Others nest in their branches: there’s an active red-shouldered hawk nest in a sycamore beside a well-traveled footbridge near the visitors’ center, and nesting sparrows, gold- and purple finches, phoebes and flycatchers, crows, jays. I do miss the yellow-billed magpie colony that used to live in the park; they all vanished a few years ago and I don’t know if they died of West Nile virus or just decided to get outta town.

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1 | By: PSoTD on May 1, 2008 at 02:57 AM

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I love Sunol Park, spent many times there.  The magpies are gone?  I find that very surprising, when we lived in the area they seemed to be expanding their population.

We had a class in high school that would go to Sunol for field trips - Field Biology - and we’d find owl pellets and investigate them to determine what the owls are eating.  Sounds gross but was actually really interesting.  I think the next time I’m in the Bay Area I’m going to try to save a bit of time to spend at Sunol.

2 | By: Ron Sullivan on May 1, 2008 at 08:11 AM

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Owl pellets are great! We’ve got a handful of them lying around here in ziplock bags, and a vole skull from one of them, in a plastic box. You couldn’t ask for a neater dissection.

Yeah, that magpie colony vanished at least three - four years ago; Joe was writing something about the species and we went there hoping to get a photo or two, and when we couldn’t find them he contacted people at UC Davis and local bird mavens and found they’d been gone for a year or two. Nobody was sure why. The species, like jays and crows and ravens, seems to be particularly vulnerable to West Nile virus; when a colony’s population gets below a certain number (which I forget) the rest tend to leave and join another group.

There are still magpies out around Livermore and up the valley to Davis. I don’t know how the big colony in Sacramento is doing. I do know that since WNV got noticed, there are people keeping an eye on many of the groups.

Yeah, great park. If you get a chance to go there whenever, it’d be fun to stroll with you.

3 | By: PSoTD on May 1, 2008 at 12:26 PM

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I’ll let you know!  My flying to the West Coast has dropped off considerably the past few years, but I know we’re due to go to the Bay Area in the next year or so.  And the offer’s reciprocated if you find yourself in Central PA sometime - Colonel Denning or Pole Steeple are worthy strolls.

Speaking of owls, we have a couple of screech owls in our area of the neighborhood down by the creek, and try as I might, can’t find any owl pellets to investigate with the kids.  About 7 or 8 years ago I found a couple by the neighborhood swingset, but our daughter was too young to be interested in it and I didn’t keep them.  Sooner or later I’ll spot some.

4 | By: Sara on May 7, 2008 at 10:58 AM

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Beautiful.  I love all the intricate details.

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