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Message: <blockquote data-quote="JANJ" data-source="post: 1362311" data-attributes="member: 20722">Could  be a hybrid Caspian x Herring as suggested but a pure Herring - perhaps not -although structurally it would fit one. However, I don´t see a pure Caspian structurally (good fit on plumage for 2cy type Caspian), large head, wrong bill structure, especially to short-billed if a male, short primary projection and rather short legs, although some Caspian looks shorter-legged - both in the field and in images. 'Bump' behind  the legs Caspian feature alright.<a href="http://www.xs4all.nl/~daarruud/cachinnans3b.html" target="_blank">http://www.xs4all.nl/~daarruud/cachinnans3b.html</a><a href="http://waarneming.nl/foto/view/572763" target="_blank">http://waarneming.nl/foto/view/572763</a><a href="http://www.iesmeulmeester.nl/fotos.php?actie=subcat&cat=1&subcat=2&kj=2" target="_blank">http://www.iesmeulmeester.nl/fotos.php?actie=subcat&cat=1&subcat=2&kj=2</a>Harry - I can´t say anything about the number of 2-3cy Caspians lacking the mirroron p10, but it is a variable character, most of which I have seen have had a mirror, from very small - hardly noticeable, to quite large, clearly visible.No mirror on this one:<a href="http://www.xs4all.nl/~calidris/caspian3w2.htm" target="_blank">http://www.xs4all.nl/~calidris/caspian3w2.htm</a>Note similarities on this one to the subject gull, but also note structurally differences, as mentioned above.<a href="http://www.xs4all.nl/~calidris/caspian5w2.htm" target="_blank">http://www.xs4all.nl/~calidris/caspian5w2.htm</a>JanJ</blockquote>

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