Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Herring Gull argentatus hybrid X311 6CY-10CY, 2021-2025, Andijk & De Kreupel, the Netherlands. Picture: Leon Kelder, Thijs Horst & Mars Muusse.

Tarsus ring y-X311 and metal Hiddensee EA204311, ringed as pullus Larus cachinnans hybrid on June 06 2016 at Gräbendorfer See, Germany.
Breeding season at colony De Kreupel: 2021, 2022, 2023.

In 2021: nest D8.
Y-311 is male parent & unringed female Herring Gull (type).
Nest with 3 eggs.
Nest with 3 chicks. All 3 chicks ringed, and observed one week after ringing in 2021. No subsequent records (within 2021 so far).
B-D|S
B-D|T
B-D|U

In 2022: Nest D1.
Y-X311 is male parent, again nesting on island D.
Nest with 3 eggs.
Nest with 3 chicks. One chick dead in nest, other 2 chicks ringed: r-3X and r-3Y.
June 17 2022 both large juveniles dead in colony. Rings r-3X and 3-3Y re-used in another nest.
Breeding success in 2022: 0.

below: Herring Gull argentatus hybrid X311 10CY, July 13 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Close match to Yellow-legged Gull (Larus michahellis).

below: Herring Gull argentatus hybrid X311 9CY, July 28 2024, De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Herring Gull argentatus hybrid X311 9CY, March 03-04 2024, Andijk harbour, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Stubby bill. Broad medial band on P10.

below: Herring Gull argentatus hybrid X311 8CY, February 03 2023, Andijk, the Netherlands. Picture: Leon Kelder.

below: Herring Gull argentatus hybrid X311 7CY, May 20 2022, De Kreupel - D, the Netherlands. Picture: Leon Kelder.

below: Herring Gull argentatus hybrid X311 6CY, March 03 2021, Andijk harbour, the Netherlands. Picture: Leon Kelder.