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 B:J 1CY, July 2025, colony De Kreupel, the Netherlands.

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

Tibia Y-B:J and NLA 5.633.717, ringed as pullus F1 L. 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. Loeve
26-07-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Thijs Horst
06-08-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read Job ten Horn & Suse Kühn

Data for nest Q46 - 2025.

Metal ring Colour ring Date Species Age Clutch size Location Nest code Ringer Head+Bill Mass Wing Parents
NLA 5633717 y-B:J 16-5-2025 Caspian Gull pullus 2 eggs the Netherlands, De Kreupel - eiland Q. Q46 Leon Kelder 49,0 70,0
NLA 5633718 y-B:K 16-5-2025 Caspian Gull pullus 2 eggs the Netherlands, De Kreupel - eiland Q. Q46 Leon Kelder 51,9 75,0
NLA 5633718 y-B:K 30-5-2025 Caspian Gull pullus -- the Netherlands, De Kreupel - eiland Q. Q46 Leon Kelder

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

Probably with hybrid traits (tertials, tail, head shape).