Herring Gull (argentatus & argenteus)
(last update: February 11, 2013)
Herring Gull sub-adult, May 05 2013, Brouwersdam, the Netherlands.
No active moult P1-P10 still present.
Sub-adult, no ring, no provenance on origin and age but probably 5CY.
Aged by vestiges of immaturity, most noticable dark markings in centres of the greater primary coverts, in combination with adult-like pattern on primaries, all secondaries and clear white tail.
