Herring Gull (argentatus & argenteus)
(last update: February 11, 2013)
Herring Gull 2cy, July 18 2013, Noordwijk, the Netherlands.
Active moult / complete moult in summer months: P6/P9. P7 about halfway its final length.
Active moult in secondaries and tail as well. S1 new, small group of outer secondaries S2-S5? missing. Central and inner secondaries still juvenile. Central tail-feathers missing/growing, probably R5 still present.
Many coverts renewed. Missing central greater coverts expose base on secondaries lying underneath. Note greater covert row have two moult waves, one starting at outer feathers and another from inside.
Below: together with 2CY Lesser Black-backed Gull.