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|7 1CY, May, August & October 2020, Lelystad & Dordtse Biesbosch, the Netherlands. Picture: Merijn Loeve, Eric Roeland & Jos Koopman.

Black bar tibia ring n[F|7], ringed as pullus Larus cachinnans on May 21 2020 at nest 006 y[PESV] in colony Lelystad, the Netherlands.
Certainty on ID, breeders are Caspian Gull cachinnans, one partner is ringed yellow PESV and one unringed partner. Neighbours of yellow PLDP (nest 005).

datum: egg no: width (mm) length (mm) volume (cm3):   
15-04-2020 A 51 71,8 94,03 3 eggs in nest.
15-04-2020 B 51,4 70,9 94,31
15-04-2020 C 51,1 71,2 93,61
  sum nest: 281,95
07-05-2020 pullus   Nest with 3 small chicks (5 days old, 1 day old, 1 day old).
   
21-05-2020 pullus n[F|1] 2 pulli ringed.
21-05-2020 pullus n[F|7] 2 pulli ringed. n[F|7] ringed beneath nest near water.
   
02-06-2020 pullus 3 juveniles together, largest chick unringed swimming around.
02-06-2020 pullus 3 juveniles together, including n[F|1].
02-06-2020 pullus 3 juveniles together, including n[F|7].

below: Caspian Gull cachinnans F|7 1CY, October 15 2020, Dordtse Biesbosch, the Netherlands. Picture: Jos Koopman.

below: Caspian Gull cachinnans F|7 1CY, October 15 2020, Dordtse Biesbosch, the Netherlands. Picture: Merijn Loeve.

below: Caspian Gull cachinnans F|7 1CY, August 14 2020, Oostvaardersdijk - Lelystad, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans F|7 1CY, May 21 2020, Lelystad, the Netherlands. Picture: Merijn Loeve.