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Why has it got a white head?
It is a juvenile ident by black spot. It will get a black head when adult.
Thanks for the explanation.
On the black head it depends when the photo was taken as they all look like that over winter.Mediterranean gulls are quite rare compared to black headed gulls so the chances are any gull that looks like that is going to be a black headed gull. I'd certainly be hard put to tell the difference. That's why I carry a big zoom compact camera when birding - I can't get top notch pictures but they are usually good enough for after the event identification.