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 1/3 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.
