Lesser Black-backed Gull XF 4CY, June 16 2013, Noordwijk, the Netherlands. Pictures Frank van der Meer.
Black tibia XF, ringed as pullus in 2010 at Neeltje Jans, the Netherlands, ringed by Roland-Jan Buijs.
Regarding moult, classic graellsii-type bird, still with immature markings in tail, tertial centres and coverts. Small white tips to primaries worn away and mirror on P10 must be very small or absent.
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