Lesser Black-backed Gull (graellsii & intermedius)(last update: May 17 2015) |
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lbbg 1cy May lbbg 2cy January lbbg 3cy Jan-April lbbg sub-ad Jan-April lbbg adult January |
Lesser Black-backed Gull graellsii NLA 5.332.974 adult, May 03 2004, EMO Maasvlakte, the Netherlands (51.59N,04.02E).Arnhem 5.332.974, ringed as adult (5CY) in 2000 at Castricum.
The primary
tips look very neat on this adult female. Note the extensive white mirror on
P10, merging with the tip. It's often stated that females have smaller mirrors
on P10 and often lack the P9 mirror, but the feature of a smaller sized mirror
only applies for the average population; single individuals may show severe
overlap. Besides the gender differences, there is also a tendency for smaller
mirrors in eastern populations (compare UK graellsii with Finnish fuscus). |