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:9 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-C:9 and metal 5.633.745, 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

Data for nest D7 - 2025.
Adults for nest D7 are Herring Gull and Caspian Gull.

Metal ring Colour ring Date Species Age Clutch size Location Nest code Ringer Head+Bill Mass Wing Parents
NLA 5633744 y-C:8 16-5-2025 Caspian Gull pullus 3 eggs the Netherlands, De Kreupel - eiland D. D7 Leon Kelder 60,8 133,0
NLA 5633745 y-C:9 16-5-2025 Caspian Gull pullus 3 eggs the Netherlands, De Kreupel - eiland D. D7 Leon Kelder 51,1 61,0
NLA 5633746 y-C:A 16-5-2025 Caspian Gull pullus 3 eggs the Netherlands, De Kreupel - eiland D. D7 Leon Kelder 55,7 99,0

below: Caspian Gull cachinnans hybrid C:9 1CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans x Herring Gull argenteus nest D7, May 2025, colony De Kreupel, the Netherlands. Picture: Leon Kelder - camera trap.

Adults for nest D7 are Herring Gull and Caspian Gull.