Date: 3/22/25 12:09 pm From: randycollignon via groups.io <randycollignon...> Subject: Re: [SFBirds] apparent WINTER WREN @ Golden Gate Heights Park
Good advise Zac. I got some snippets of the chimp/bark calls of the possible Winter Wren with a handheld field recorder this morning at close range with Keith. I work nights, so I need to get to bed but should have them uploaded to Ebird by tomorrow morning for people to analyze, and will submit to CBRC. I also got song and chattering calls. Challenging bird to ID, but that kind of makes it a fun attempt.
Best,
Randy Collignon
SF
On Sat, Mar 22, 2025 at 10:08 AM, Zac Denning wrote:
>
> Awesome find Rajan!
>
> I very much defer to the experts, but based on feedback from the 3 WIWR
> candidates I encountered this Winter, this seems at least promising. The
> sonogram for the bark calls looks as expected, with stacked inverted
> chevron shaped harmonics, and with the highest energy portion below 4 KHz.
>
>
> I’m not sure if software would improve things, but to help rule out the
> uncommon ‘tweener’ calls (that I understand PAWR can occasionally make), a
> better recording may be helpful. This would ideally show the shape of the
> lowest harmonic band in the sonogram, which is indistinct / overwhelmed by
> background noise in these sonograms. Ethan Monk and others are far more
> expert in this, but that’s what crude understanding I’ve gleaned from
> recent birds.
>
> Also, based on my recent experience, there seems to be a very short window
> in which WIWR can be more easily observed. All 3 birds that I saw were
> most easily observed at the initial encounter and for a very short period
> afterward. After that, the bird may go deep into cover, may stop
> responding to pishing or playback, or may perhaps move on. So now would be
> the time to try to get better recordings of this bird!
>
> That’s what little I know - and the experts will have better feedback I’m
> sure. Nice find once again!
>
>
>
> Zac Denning
> Albany
>
>
>
>
>
> On Sat, Mar 22, 2025 at 8:39 AM Dominik Mosur via groups.io (
> http://groups.io ) <dominikmosur= <gmail.com...> > wrote:
>
>> Good morning SF Birders,
>>
>> Yesterday afternoon (3/21/25), one of our young superstar birders, RAJAN
>> RAO, discovered an apparent WINTER WREN at Golden Gate Heights Park.
>>
>> Here's Rajan's list with recordings and photos:
>>
>> https://ebird.org/checklist/S219870675 >>
>> Several people who have experience with Winter Wren expressed that it
>> sounds really good for a potential winter wren but more documentation
>> would be great.
>>
>> I stopped there yesterday evening to follow up and was not able to
>> relocate it hearing only a typical Pacific Wren at the same spot. BUT, a
>> visit at sunrise today turned up both a Pacific and the putative WINTER
>> WREN at these approximate GPS coordinates :
>> 37.74947, -122.4689
>>
>> Do note that this is a state review species so if you go see the bird and
>> manage photos/recordings please submit them to the California BIrd Record
>> Committee at this link:
>> https://californiabirds.org/report_sighting.html >>
>>
>> Happy Spring,
>>
>> Dominik Mosur
>> San Francisco
>>
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