Lesser Black-backed Gull (graellsii & intermedius)
L. f. graellsii R6RW January 04 2009, Landfill VRSU de Colmenar Viejo, Madrid, Spain. Picture: Delfín González.
PVC black R6RW and metal BTO GA40511, ringed as pullus at Ribble Estuary, Lancashire, UK (53º 42´N,02º 55´W), on July 01 2006, by David Sowter.
Ringed 4cy graellsii, ringed in the U.K. P10 fully grown, with obvious mirror, immature bird.