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F. Deroussen ( www.xeno-canto.org )
The Audouin's Gull breeds in the Mediterranean region and is quite rare in the north. In the Netherlands, it has only been seen a few times. A striking feature is the dark eye.
http://en.wikipedia.org/wiki/Ichthyaetus_audouinii
http://eol.org/pages/1049301/maps