Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Herring Gull sub-adult , March 01 2014, Katwijk, the Netherlands.

Probably 5CY, now with 4th gen flight feathers. In general birds very adult-like, but few vestiges of immaturity, either dark centres on greater primary coverts, small blackish spots in tail or much black on bill.