4cy Caspian type

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little-W
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4cy Caspian type

Post by little-W » Mon Oct 14, 2013 6:53 pm

Hi all,

I would like your thoughts on this 4th-calendar type bird, seen last week at the waste dump of Barneveld, The Netherlands.

It is showing a mix of Caspian and Herring/Yellow-legged features:

- Broad bill with well-marked gonydeal angle (Herring/Yellow-legged)
- Dark iris
- Head pattern reminiscent of Yellow-legged
- Gray tone as Caspian (too dark for Herring, too light for Yellow-legged/argentatus?)
- P10 with white type and small dark spots on both webs and P9 with small mirrors on inner web should rule out Yellow-legged
- P10 tongue invisible unfortunately
- P5 with black on both webs forming band, on outer web deeper than on inner
- No black on P4
- All white tail
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Regards,

Maarten van Kleinwee
The Netherlands
http://www.flickr.com/photos/little-w/
Blog: Gulls to the horizon
Twitter: @Argentatus

adriaens
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Re: 4cy Caspian type

Post by adriaens » Sat Oct 19, 2013 3:26 pm

Hi Maarten,
before going into the hybrid/Caspian debate, I am wondering if this is not some kind of Herring Gull?
I see nothing that really excludes that option...

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little-W
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Re: 4cy Caspian type

Post by little-W » Mon Oct 28, 2013 11:49 am

Hi Peter,

No, I can't exclude a Herring either.
Other suggestions that I have received about this bird so far range from 'something funny from Poland' and Yellow-legged.
Regards,

Maarten van Kleinwee
The Netherlands
http://www.flickr.com/photos/little-w/
Blog: Gulls to the horizon
Twitter: @Argentatus

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Theo Muusse
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Location:Dordrecht

Re: 4cy Caspian type

Post by Theo Muusse » Mon Oct 28, 2013 10:25 pm

I am in the Peter camp.
There is a herring feeling on this....

Theo

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