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 1/2 its final length.
Active moult in secondaries and tail as well. S1 growing. Central and inner secondaries still juvenile. Central tail-feathers missing/growing.
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 3CY Herring Gull.
