Date: 5/5/19 6:14 am
From: Joe Morlan <jmorlan...>
Subject: Re: [SFBirds] Possible Black-tailed Gull Lake Merced Boathouse
All,

Just for reference, I thought I would share photos of first and second
cycle Black-tailed Gulls from 7 May last year in Japan. They are the top
two photos here:

https://fog.ccsf.edu/~jmorlan/Japan-Alaska17/Black-tailedGullIMG_7618.htm


On Sat, 4 May 2019 20:49:49 -0700, "Alvaro Jaramillo"
<chucao...> wrote:

>Peter
> Hey there. I am confused here, to me this bird looks like a perfectly
>normal California Gull except for the bill. The bill is deformed, and apart
>from the shape, one telltale feature that it is deformed is that mealy look
>to the color of the bill. Often deformed gulls have this mealy bill color. I
>am not sure why, but it is pretty consistent.
> The tail looks normal to me as well. This is a juvenal tail, and does
>not look odd for a worn juv. Tail to me. Back darkness looks normal as well.
>
> Cheers,
>Alvaro
>
>Alvaro Jaramillo
><alvaro...>
>www.alvarosadventures.com
>
>-----Original Message-----
>From: <SFBirds...> <SFBirds...> On Behalf Of Peter Pyle
>Sent: Saturday, May 4, 2019 8:16 PM
>To: Alvaro Jaramillo <chucao...>
>Cc: <SFBirds...>
>Subject: Re: [SFBirds] Possible Black-tailed Gull Lake Merced Boathouse
>
>I've done some research and can't find close matches with second-cycle
>Black-tailed so will re-identify it in eBird as Gull sp.
>The back still looks dark to me for CAGU and I'd like to find one with a
>tail pattern like this bird has. Both species at this age are of course
>extremely variable, which makes it but fun and a challenge.
>Comments on specific identification criteria, pro and con, still welcomed.
>
>Peter
>
>At 07:48 PM 5/4/2019, Alvaro Jaramillo wrote:
>>Peter
>> It is a California Gull with a deformed bill.
>>Alvaro
>>
>>Alvaro Jaramillo
>><alvaro...>
>>www.alvarosadventures.com
>>
>>-----Original Message-----
>>From: <SFBirds...> <SFBirds...> On Behalf Of Peter Pyle
>>Sent: Saturday, May 4, 2019 6:13 PM
>>To: <SFBirds...>
>>Subject: Re: [SFBirds] Possible Black-tailed Gull Lake Merced Boathouse
>>
>><https://ebird.org/view/checklist/S55815948>https://ebird.org/view/chec
>>klist
>>/S55815948
>>
>>
>>comments welcome on photos. P
>>
>>At 05:30 PM 5/4/2019, Peter Pyle via Groups.Io wrote:
>> >Just getting a quick word out. It's a second-cycle bird with a big
>> >long bill - thought it was a deform-billed CAGU but now that I'm
>> >looking at my photos the darker back and tail pattern may point more
>> >to Black-tailed. Will post photos to eBird. It was on the western of
>> >the three docks, the wide trex one. I flushed it to get flight shots
>> >but it pulled around and landed back on the dock with about 25 WEGUs.
>> >Also the continuing Palm Warbler in the myopoum at the top of the
>pull-out hill.
>> >
>> >This is in Lake Merced Park along Harding Road to the entrance of
>> >Harding Park golf course, north end of south arm of Lake Merced.
>> >
>> >Cheers, Peter
>> >
>> >
>> >
>>
>>
>>
>>
>>
>>---
>>This email has been checked for viruses by AVG.
>>https://www.avg.com
>
>
>
>
>
>
--
Joseph Morlan, Pacifica, CA

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