Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Herring Gull sub-adult, July 18 2013, Noordwijk, the Netherlands.

Probably 4CY, but no ring, no provenance on origin and age.
Aged by vestiges of immaturity, most noticable dark markings in centres of the greater porimary coverts, in combination with adult-like pattern on primaries and secondaries.
Active moult in primaries (complete moult in summer months): P3/P6.