Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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

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Caspian Gull cachinnans FM 1CY-2CY, May 2021 & July 2022, De Kreupel & Almere, the Netherlands. Picture: Leon Kelder & Eric Roeland.

Tibia P-FM and metal Arnhem 5.556.709, ringed as pullus Larus cachinnans on May 14 2021 at IJsselmeer (De Kreupel), Holland (5247.00 N 513.00 E) - ringer Leon Kelder.
Pullus at nest C04 21 in colony De Kreupel island C, the Netherlands. ID uncertain: parents are unknown.

Recoveries:
04-07-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland

Data for nest C04-2021:

Date: details:          
           
23-4-2021 2 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
    A egg 52.0 71.3
    B egg 51.3 74.5
Attempt to trap adult at nest. Failed.          
   
14-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  https://waarneming.nl/observation/214661957/ NLA 5.556.708 Pale FL 74 50.5 29.1
    NLA 5.556.709 Pale FM 78 53.4 27.7
   
20-5-2021 Empty nest.          

below: Caspian Gull cachinnans FM 2CY, July 04 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans FM 1CY, May 14 2021, De Kreupel - C, the Netherlands. Picture: Leon Kelder.