| Coordinators:Jean-Michel Sauvage (France)
 Mars Muusse (the Netherlands)
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 | Herring Gull (argenteus) F|+ 1CY-2CY,  October  2018 & February - April 2019, Scheveningen & Katwijk, the Netherlands.Tibia W-F|+ and metal Arnhem NLA 6204923, ringed as 1cy male on 12-9-2018 at Scheveningen (Boulevard), Zuid-Holland, NL (5206.00 N 417.00 E), by ringer Roland-Jan Buijs. Recoveries:17-9-2018 Scheveningen (Boulevard), Zuid-Holland, NL 5.206,00 417,00 E colourring read N. Huig & R.J. Buijs
 21-10-2018 Scheveningen (Havens en Havenhoofden), Zuid-Holland, NL 5.206,00 416,00 E colourring read Mars Muusse
 7-11-2018 Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 423,00 E colourring read Annelies Marijnis
 19-1-2019 Meijendel (Strand), Zuid-Holland, NL 5.208,00 419,00 E colourring read Peter Spierenburg
 11-2-2019 Katwijk aan Zee (Strand), Zuid-Holland, NL 5.213,00 424,00 E colourring read Mars Muusse
 27-2-2019 Katwijk aan Zee (Strand), Zuid-Holland, NL 5.213,00 424,00 E colourring read Mars Muusse
 below: Herring Gull (argenteus) F||+ 2CY, April 08 2019, Katwijk beach, the Netherlands.
 below: Herring Gull (argenteus) F||+ 2CY, February 27 2019, Katwijk, the Netherlands.
 
 
 below: Herring Gull (argenteus) F||+ 2CY, February 11 2019, Katwijk, the Netherlands.
 
 below: Herring Gull (argenteus) F|+ 1CY,  October 21 2018, Scheveningen, the Netherlands.Lower scaps still juvenile. 
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