© A. R. Dean

An adult Mediterranean Gull in transition from summer plumage.
This individual was ringed on the breeding grounds in NE Poland in May 2013 and has appeared in the West Midlands in late summer
(generally late July/early August) in several consecutive years, with scattered observations later in the autumn or winter.
However, since ringing it has not returned to Poland but has been observed in winter, spring and summer at the reserve at
Thumeries des Cinq Tailles, in Pas-de-Calais in northern France (per BTO and Polish Ringing Scheme), where it is now presumably breeding.
Thus, its movements from there to Olton now involve a more modest 400km rather than the original 1500km from its ringing site in Poland.

© A. R. Dean

Head just beginning moult but wing-moult more advanced, with several inner primaries dropped.