Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

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Caspian Gull cachinnans F|W 1CY, May & September 2020, Lelystad & Wassenaar, the Netherlands. Picture: Albert de Jong, Mars Muusse & Merijn Loeve.

Black tibia bar ring n[F|W], ringed as pullus Larus cachinnans on May 21 2020 at nest 35 in colony Lelystad, the Netherlands.
ID certain, both parents are Caspian Gull cachinnans.

datum: egg no: width (mm) length (mm) volume (cm3):  water test on May 7th:  
07-05-2020 A 50,3 70,4 89,68 90 - floating, 7mm above surface 3 eggs in the nest.
07-05-2020 B 50 77,8 97,93 90 - floating, 5mm above surface  
07-05-2020 C 50,6 74,9 96,56 90 - floating, 6mm above surface
  sum nest: 284,17  
21-05-2020 pulli     1 egg intact, but embryo dead. Two chicks here, ringed n[F|V] & n[F|W].

Caspian Gull cachinnans F|W 1CY, September 26 2020, Wassenaar beach, the Netherlands. Picture: Albert de Jong.

All coverts and tertials still juvenile.

Caspian Gull cachinnans F|W 1CY, September 11 2020, Katwijk beach, the Netherlands. Picture: Mars Muusse.

All coverts and tertials still juvenile.

Caspian Gull cachinnans F|W 1CY, May 21 2020, Lelystad, the Netherlands. Picture: Merijn Loeve.

Roland-Jan Buijs & Albert de Jong.