Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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Caspian Gull cachinnans hybrid C:U 1CY, 2025, the Netherlands. Picture: Hans van Muiswinkel, Thijs Horst & Mars Muusse.

You can participate in this project too! Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl

Tibia Y-C:U and metal 5.633.765, ringed as pullus F1-hybrid Larus argentatus x L. cachinnans on May 16 2025 at IJsselmeer (De Kreupel), Noord-Holland, by ringer Leon Kelder.

Recoveries:
13-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst, M. Muusse & N. Colpaert
18-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
26-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Thijs Horst
19-09-2025 Wervershoof (Vooroever), Noord-Holland, NL 5.245,00 N 507,00 E colourring read Wim de Lange
05-10-2025 Sint Nicolaasga (Food Recycling), Friesland, NL 5.254,00 N 544,00 E colourring read Hans van Muiswinkel

Data for nest K1 - 2025.

Metal ring Colour ring Date Species Age Clutch size Location Nest code Ringer Head+Bill Mass Wing Parents
NLA 5633764 y-C:T 16-5-2025 Caspian Gull pullus 2 eggs the Netherlands, De Kreupel - eiland K. K1 Leon Kelder 68,1 226,0
NLA 5633764 y-C:T 30-5-2025 Caspian Gull pullus -- the Netherlands, De Kreupel - eiland K. K1 Leon Kelder
NLA 5633765 y-C:U 16-5-2025 Caspian Gull pullus 2 eggs the Netherlands, De Kreupel - eiland K. K1 Leon Kelder 64,4 195,0

below: Caspian Gull cachinnans hybrid C:U 1CY, November 09 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid C:U 1CY, October 05 2025, Spakenburg, the Netherlands. Picture: Hans van Muiswinkel.

below: Caspian Gull cachinnans hybrid C:U 1CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

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