Lesser Black-backed Gull graellsii H.1 4CY, June 05 2015, Utrecht, the Netherlands. Picture: Herman Bouman.
Ringed as pullus in July 2012 at BP-Europoort, Maasvlakte, the Netherlands, now in 4CY.
Immature patterns in coverts, secondaries, primary coverts and tail. Small mirror on 3rd gen P10. P1-P10 old, complete moult not started yet.
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