| Coordinator: Albert de Jong
 Merijn Loeve
 Roland-Jan Buijs
 Thijs Horst
 Leon Kelder
 Mars Muusse
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 Nests at De Kreupel 2020nest  r-02P4 20
 nest y-X804 20
 nest D01 20
 nest D02 20
 nest D03 20
 nest L01 20
 nest L02 20
 nest L03 20
 nest M02 20
 Nests at De Kreupel 2021nest  r-02P4 20
 nest w-201U 21
 nest g-XLHD 21
 nest r-KA 21
 nest r-KB 21
 nest r-KC 21
 nest r-KD 21
 nest r-KE 21
 nest r-KF 21
 nest r-KH 21
 nest r-KJ 21
 nest r-KK 21
 nest A01 21
 nest C03 21
 nest C04 21
 nest C06 21
 nest D01 21
 nest D03 21
 nest D05 21
 nest D06 21
 nest D07 21
 nest D08 21
 nest E01 21
 nest H01 21
 nest L01 21
 nest L02 21
 nest L05 21
 nest L06 21
 nest L07 21
 nest M01 21
 nest M04 21
 nest M06 21
 nest Q01 21
 | Herring Gull argentatus  K.6 1CY-2CY, May 2021 & February 2022, De Kreupel & Medemblik, the Netherlands. Picture: Leon Kelder & Renate Visscher. Red  tibia  ring r[K.6], ringed as pullus Larus argentatus on May 14 2021 at nest M06 21 in colony De Kreupel, the Netherlands. ID is uncertain: both parents are unknown. Preliminary ID based on sandy plumage of pulli.
 Tibia  R-K6 and metal NLA 5.556.740, ringed as pullus Herring Gull (Larus argentatus) on 14-5-2021 at IJsselmeer (De Kreupel), Holland (5247.00 N 513.00 E). Ringer  Leon Kelder. Recoveries:28-09-2021 Den Oever (Buitenhaven), Noord-Holland, NL 5.256,00 N 502,00 E colourring read Bert Winters
 23-10-2021 Den Oever (Buitenhaven), Noord-Holland, NL 5.256,00 N 502,00 E colourring read Bert Winters
 19-12-2021 Den Oever (Buitenhaven), Noord-Holland, NL 5.256,00 N 502,00 E colourring read Jan Willem Dekker
 24-02-2022 Wieringermeer (Zuiderdijkweg), Noord-Holland, NL 5.246,00 N 506,00 E colourring read Renate Visscher
 below: Herring Gull argentatus  K.6 2CY, February 24 2022, gemaal Lely - Medemblik, the Netherlands. Picture: Renate Visscher. 
 below: Herring Gull argentatus  K.6 1CY, May 14 2021, De Kreupel  - M, the Netherlands. Picture: Leon Kelder.       
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