Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Herring Gull sub-adult, June 09 2013, Noordwijk, the Netherlands.

Probably 5CY nominate argentatus, with adult-like secondaries and white tail. Vestiges of dark immature pattern on primary coverts. Mirror on P10 and P9. No black on P5.
Active moult in primaries (complete moult): P1/P3.