Lesser Black-backed Gull graellsii NY 4CY, May 30 2015, Vlissingen, the Netherlands. Picture: Merijn Loeve.
Ringed as 4CY. Trapped by ringing team Roland-Jan Buijs (see: Buijs Ecoconsult BLOG) on bread, hence no proof on breeding at Vlissingen.
Immature patterns in coverts, secondaries, primary coverts and tail. No mirror on 3rd gen P10. P1-P10 old, complete moult not started yet.
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