Peter Adriaens (Belgium)
Ies Meulmeester (Netherlands)
Larus cachinnans (hybrid?) XHHD 3CY, April 02 2017, Katwijk, the Netherlands. Picture: Mars Muusse.
Green XHHD and metal DEH (Hiddensee) EA..052003.
Species: Herring Gull (Group) (Larus argent./cachin./michah.)
This colony is 100 km SW of Berlin near Bad Düben, and holds a mixed colony in the lake. At this location ringing takes place in colonies of mixed species, with Herring, Caspian and Yellow-legged Gull, so identification is not always straight forward. The possibility that juveniles are not a pure bird is therefore not unlikely. This bird XHHD has at least one of the parents cachinnans.
XHHD has a rich yellow tone on the bill and the upperparts are obviously darker grey than local Herring Gull argenteus. The bold pattern on 2nd gen coverts recalls michahellis. Streaking on head may be inherited from argentatus?