Albert de Jong
Larus cachinnans 3CY 290P August 09 2009, Lakolk strand, Denmark. Picture: Kent Olsen.
Green 290P and metal DN21577. Bird ringed as pullus on May 18 2007 at Palczowice Zwirownia Zator, Poland.
Note mirror on old 2nd gen P10. Bird in active complete moult: P6/P9. Note dark centred 2nd gen secondaries, visible now the central GC have been shed. At the same time, active moult in outermost secondaries and central tail feathers.