Three of these late-winter gulls were photographed in Bahrain
- the fourth one wasn't! The Bahrain birds are probably heuglini,
the other should be graellsii (on range). Please email
me, stating which one you think is the odd-one-out, what you
think it is, and why - thanks! NOTE:
I have distorted any other gulls in the background, to remove
clues!