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 F.4 1CY, June 26 2021, Lelystad, the Netherlands. Picture: Jeroen Nagtegaal & Mars Muusse.

Ringed as pullus Caspian Gull Larus cachinnans on June 26 2021 at nest 43 in colony Lelystad, the Netherlands.
Visits and data:

date:                  
28-05-2021 Decided to put out a cage to trap a breeding adult here. Successful. Adult male cachinnans trapped today.
  2 eggs in nest.              
  egg no: width (mm) length (mm) volume (cm3):  water test on May 28th:         
  A egg 74,5 50,4 95,28 90 - floating 2 mm        
  B egg 66,4 46,5 72,29 90 - floating 2 mm        
  sum nest: --          
  metal tibia mass (gr) head + bill (mm) wing (mm) tarsus (mm) bill (mm) gonys (mm)
  adult .6213012 r-F.C 1332 135,6 464 71 66 19,3
   
08-06-2021 2 partners at nest. male guarding at blocks. Large female at nest. 3 meters to the west is LBBG nest (also behind trunk).
   
    metal tibia mass (gr) head + bill (mm) wing (mm)  
26-06-2021 pullus .5550699 r-F.3 714 98,3 151 cachinnans
  pullus .5550700 r-F.4 466 87,2 110 cachinnans