L. f. graellsii H.010 September 01 2010, Westkapelle, the Netherlands.
Bird probably ringed July 2007, now 4cy. Ringed graellsii "Dutch intergrade", these yellow rings used on islands in N Germany. Birds from these colonies form the transition into Scandinavian intermedius, which start to breed at Denmark, according to Barth's findings in the 60's and 70's: HERE & HERE.
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