Lesser Black-backed Gull graellsii UV.AM 4CY, July 08 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
Ringed as pullus in 2012 at Zeebrugge (Voorhaven), West-Vlaanderen, Belgium (51°21'0''N 3°11'0''E).
Now 4CY bird, very retarded in plumage development and could have been taken for 3CY bird if it had not been ringed.
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