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Old Wednesday 21st January 2009, 14:03   #1
khustochka
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Larus canus or L. cachinnans? Kiev, Ukraine

Is this Larus canus or L. cachinnans? Picture taken a few days ago, Kiev, Ukraine
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Old Wednesday 21st January 2009, 14:15   #2
Cristian Mihai
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Hi,
This is a Common Gull: http://farm4.static.flickr.com/3089/...dc940f.jpg?v=0
So, what do you think, it looks like yours?
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Old Wednesday 21st January 2009, 14:21   #3
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Well, it looks like... I'm not sure about the bill. Whether it is more or less massive.
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Old Wednesday 21st January 2009, 15:00   #4
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Hello all.

canus or cachinnans? A very good question, although some might think this an odd comparison - but canus signals cachinnans due to dark eye and rather similar pattern on outer primaries (p10 & p9). However, in this flying gull all the cachinnans features are visible. So the gull is not a Common Gull.
A quick look at the primary pattern on the underwing in Cristans Common Gull and this one:

http://www.tarsiger.com/images/masa/Larcan55.jpg

shows that on p10, 9 and to a lesser extent also p8 there´smore black compared to cachinnans. Mirror on p10 & 9 are rather similar, with a dark subterminal band on p10 in canus, which is sometimes lacking, as it can be present in cachinnans.
The structure and bill size is much better for cachinnans, probably a female (smaller -billed compared to a male.

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Old Wednesday 21st January 2009, 15:01   #5
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I think it's a ylg, based on the bill mark.
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Old Wednesday 21st January 2009, 15:20   #6
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shrikebirder, I thought common gull may have the bill mark in winter.

JANJ, great thanks for the profound answer!
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Old Wednesday 21st January 2009, 15:52   #7
Cristian Mihai
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Quote:
Originally Posted by shrikebirder View Post
I think it's a ylg, based on the bill mark.
The wing pattern looks good for a Caspian Gull (L. cachinnans), but no so good for a Yellow-legged Gull (L. michahellis).
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Old Wednesday 21st January 2009, 17:27   #8
lou salomon
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hello khustochka,

definitely a caspian gull (larus cachinnans). among the argentatus relatives adult caspian gull is most likely to show a dark subterminal mark on bill. surely common gull (canus) does have such a mark as well. this bird has the structure of a large white headed gull with a proportionally smaller head and heavier body. bill is seen from below thus giving the slim appearance. primary pattern, as said above, is spot on for cachinnans, not so for canus or michahellis.

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Old Wednesday 21st January 2009, 18:23   #9
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Yes a definite cachinnans.
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Old Wednesday 21st January 2009, 21:20   #10
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Great thanks, Lou, Josh Jones!
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