Herring Gull 6cy SZ (argenteus) July 29 2011, Barneveld, the Netherlands. Pictures: Maarten van Kleinwee.
Ringed as juvenile on June 16 2006 at Moerdijk, The Netherlands.
Performing a long-call in which a loud long-drawn call is given with the bill wide open.P1 - P4 are new, P5 is just growing and P6 has been dropped. Moult can also be seen around the eye. PMS=23 (P1=5, P2=5, P3=5, P4=5, P5=2, P6=1, P7=0, P8=0, P9=0, P10=0).