| Coordinators:Albert de Jong
 Leon Kelder
 Roland-Jan Buijs
 Thijs Horst
 Merijn Loeve
 Mars Muusse
 Home Project InfoInternational trend
 National trend
 Site characteristics
 Breeding biology
 Fecundity
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 | HerringGull argenteus  P|3 1CY, September 28 2025, IJmuiden, the Netherlands. Picture: Mars Muusse.Tibia G-P|3 and metal NLA 5.639.271 ringed as pullus Larus argentatus on July 02 2025 at  Den Oever (Leidam), Holland, NL 5256.00 N 502.00 E, by ringer : Leon Kelder. Recoveries:10-09-2025 IJmuiden (Kennemerstrand), Noord-Holland, NL 5.226,55 N 433,03 E colourring read Fred Cottaar
 21-09-2025 Zaandam (Hembrug), Noord-Holland, NL 5.225,00 N 449,00 E colourring read Martijn van Manen
 28-09-2025 IJmuiden (Strand Zuidpier), Noord-Holland, NL 5.227,34 N 433,03 E colourring read T. Horst, M. Muusse & F. Cottaar
 below: Herring Gull argenteus  P|3 1CY, September 28 2025, IJmuiden, the Netherlands. Picture: Mars Muusse.
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