Lesser Black-backed Gull 4cy BTO E15895 July 18 2012, Calais, NW France. Picture: Jean-Michel Sauvage.
Ringed as pullus on 10 July 2009 at Burhou, ALDERNEY (49,730582 -2,252712), UK by Paul Veron.
Note combination of white tail, mirror on P10, with immature wing-coverts.
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