Interesting links:
Gull Website by Ruud Altenburg
Ringing Activities by Roland-Jan Buijs
Papers on the WWW

Former Birdsnaps-webpages:
Black-headed Gull ridibundus (new March 07)
Common Gull canus
Slender-billed Gull genei
Mediterranean Gull melanocephalus
Great Black-backed Gull marinus (new March 07)
Heuglin's Gull & Heuglini 2cy ID pages heuglini
nominate LBBG fuscus 1cy & 2cy
LBBG graellsii & intermedius
HG argentatus & argenteus 1 cy - 3cy March (new Febr 07)

Moderators:
Ruud Altenburg ruud"at"eti.uva.nl, Amsterdam, the Netherlands
Roland-Jan Buijs rjbuijs"at"hetnet.nl, Oud-Vossemeer, the Netherlands
Bert-Jan Luijendijk bjluijendijk"at"planet.nl, Oud-Beijerland, the Netherlands
Mars Muusse marsmuusse"at"gmail.com, Amsterdam, the Netherlands
Theo Muusse theomuusse"at"chello.nl, Dordrecht, the Netherlands
Pim Wolf pimwolf"at"gmail.com, Vlissingen, the Netherlands