Lesser Black-backed Gull graellsii NLA 5.502.379 4CY, June 09 2015, Rotterdam, the Netherlands. Picture: Merijn Loeve.
Ringed as pullus in 2012 at Maasvlakte-Europoort, the Netherlands.
Broad band on bill and immature feathers in tertials and coverts. Hard to tell apart from 3CY.
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