Here's the pic of the Mediterranean and Black - headed Gull. The blood red bill on the Med Gull is an excellent detail to look out for to separate from the B H Gull. The adult Med Gull is an all white bird apart from the black hood which really is black as opposed to the B H Gull's which is actually brown. The Med Gull here does have a little black in its wing tips - if you look closely at the pic when expanded which - makes it a sub adult.
Pete.
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