Date: 4/6/21 6:49 pm
From: Dave Cameron <davednvr7...>
Subject: Re: [cobirds] Possible Slaty-backed Gull, Larimer
Thanks, Nick, for the explanation. And, it saves me a trip!

- Dave Cameron

On Tuesday, April 6, 2021 at 5:27:39 PM UTC-6 Nick Komar wrote:

> Sorry I meant to follow up. I read up on first-cycle Slaty-backed Gull
> Identification. While this bird looked similar, a couple features in
> particular ruled out Slaty-backed Gull. The outer wing (a.k.a. the hand)
> was long like Herring and Glaucous-winged, rather than short. Also the bill
> was very long with the curvature of the culmen well anterior to the
> nostrils. In Slaty-backed, the bill is short with the curvature beginning
> over the nostrils. Therefore I concluded that this bird was not
> Slaty-backed but rather a hybrid Gw x herring. This hybrid combo is
> becoming more frequent among our winter gulls, and is well known to appear
> similar to slaty-backed gull in first cycle plumages.
>
> I have been keeping an eye on the Larimer gull flock and have not seen
> this bird again.
>
> Nick Komar
>
> On Apr 6, 2021, at 4:48 PM, Dave Cameron <dave......> wrote:
>
> Has anyone had occasion to go search for this bird since the 28th? Any
> info as to whether it's still around would be appreciated. Thanks!
>
>
> Dave Cameron
> Denver
>
> On Sunday, March 28, 2021 at 10:32:50 PM UTC-6 <colima......> wrote:
>
>> Most lariphiles agree some first cycle pale-headed gulls are
>> challenging. So much variation.
>> Can you you elaborate on those “checked boxes” you mention?
>>
>> Bruce Webb
>> Former Boulder resident
>>
>> On Sun, Mar 28, 2021 at 11:42 AM Nicholas Komar <quet......>
>> wrote:
>>
>>> A first cycle large white-headed Gull at Horseshoe Reservoir in Loveland
>>> (Larimer) seems to check most boxes for Slaty-backed Gull. See photos
>>> below. Warning: this age/species combo is very difficult to confirm so may
>>> not get confirmed in eBird or accepted by a records committee. But wanted
>>> to share to give folks an opportunity to look for it.
>>>
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>>>
>>>
>>>
>>>
>>> Nick Komar
>>> Fort Collins CO
>>>
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>> --
>> Bruce Webb
>> Granite Bay, California
>>
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