Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Herring Gull (argenteus) 4CY, July 30 2014, IJmuiden, the Netherlands.

In complete moult. P1-P4 fully grown, P4 with subterminal spot, P5 growing, P6 missing, P7-P10 old 3rd gen. PMS=24. Central rectrices still present (tail feather moult centrifugal, replacement central feathers first, then outwards). Outermost secondary S1 still present, all feathers old 3rd gen (rather adult-like). GC old and bleached, new MC growing in.