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A. Lees ( www.xeno-canto.org )
With its black head, the Mediterranean Gull looks very similar to the Black-headed Gull. But the colour of the head is not the same. The Black-headed Gull has a chocolate-coloured head, the Mediterranean Gull has a pitch-black head.
http://en.wikipedia.org/wiki/Ichthyaetus_melanocephalus
http://eol.org/pages/1049313/maps