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Slaty-backed-x-Black-tailed Hybrid? or other?

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Old Sunday 8th December 2019, 11:29   #1
Otarujef
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Question Slaty-backed-x-Black-tailed Hybrid? or other?

Date: Dec. 8, 2019
Time: 12:35 pm
Location: Shukutsu, Otaru, Hokkaido, Japan
Google map: https://goo.gl/maps/DRQwS18XeZAtLDEfA
Weather: Heavy Snow

Hi!

I am fairly new to Gulls,
and need a little help if you can,
which is much appreciated!

I am looking thru the Larsson book
"Gulls of Europe, Asia,and North America";
yet I am still having trouble ID-ing
whether this is a hybrid, and which winter.

Thanks for the help with this!

Jeff
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Old Tuesday 10th December 2019, 12:21   #2
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I wonder,

Should I try and have the moderators move this to "Bird ID Q/A", where there is more traffic?

Jeff :)
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Old Tuesday 10th December 2019, 15:05   #3
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Quote:
Originally Posted by Otarujef View Post
I wonder,

Should I try and have the moderators move this to "Bird ID Q/A", where there is more traffic?

Jeff :)
Probably a good idea! I'm pretty clueless about east Asian gulls (never been there) but given the pure white tails, I can't see any hard evidence for any Black-tailed parentage in there.
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Old Tuesday 10th December 2019, 16:58   #4
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Thanks Nutcracker for the response !

I am not sure how to contact a moderator, i know double posting is a no-no.

The Gull's bill tip says Black-tailed, while the rest says Slaty-backed.
Slaty-backed have only a bit of red/orange on the bottom bill.
That is why I thought maybe a hybrid.....

Thanks again!

Jeff

Last edited by Otarujef : Tuesday 10th December 2019 at 16:59. Reason: spelling error
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Old Tuesday 10th December 2019, 17:25   #5
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Black on the bill tip is also a common sign of immaturity in large gulls. I'd hazard a guess it is a 3rd-4th year Slaty-backed, but with the proviso that's a species I have no experience of!


I see a mod has moved it now
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Old Tuesday 10th December 2019, 17:55   #6
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Gully-Gosh

Quote:
Originally Posted by Nutcracker View Post
common sign of immaturity.....
I can related to those signs even in a 60 year human such a i lol.

the detail observation is helpful, i will look and research more, and see if someone chimes in that might add to what you shared...

Thanks Nutcracker! and thanks to KC Foggin for the kindness and movin the thread...

Jeff
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Old Tuesday 10th December 2019, 18:39   #7
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See also this wonderful gull source
http://www.gull-research.org/schistisagus/3cydec.html

3cy winter for me too
Cheers
Gerben
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Old Tuesday 10th December 2019, 18:44   #8
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Thanks so much Gerben!
bookmarked the link
:thumbs up:

Jeff
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Old Wednesday 11th December 2019, 06:07   #9
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it is a slaty-backed gull allright (no hybrid). black on bill can be an immaturity sign in subadults but it happens also in basic (nonbreeding) plumage of large gulls.
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Old Wednesday 11th December 2019, 16:51   #10
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Lou,

Thank you so much for the confirmation.
I have ALOT to learn just about gulls alone.
Summer usually has just Slaty-backed and Black-tailed Gulls.
Winter starts to bring a half dozen or so more to Hokkaido.
Thanks again Everyone for helping me to understand a little bit more than before!
:thumbs up:

Jeff
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