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.F 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong, Merijn Loeve & Mars Muusse.

Red tibia ring r[F.F], ringed as pullus Larus cachinnans on May 28 2021 at nest 02 in colony Lelystad, the Netherlands.
ID certain in 2021, same breeders as previous season (2020): they are Caspian Gull cachinnans PNED 9CY and unringed adult partner.

Visits and data.

date:    
16-04-2021 y[PNED] present at nest guarding at blocks, nest with 3 eggs.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 16th:  
  A egg 52,1 77,3 105,65 35 - tip bottom  
  B egg 52 76 103,47 35 - tip bottom  
  C egg 50,8 69,5 90,30 35 - tip bottom  
    sum nest: 299,42  
     
26-04-2021 PNED present and alarming. Fight with neighbour or partner.
  Partner PNED also present.
     
06-05-2021 Picture of partner.
  2 eggs hatching, 1 pullus just emerging.
     
15-05-2021 No visit.
     
28-05-2021   metal tibia mass head + bill  
  pull .5559430 red-F.F 908 105  
  pull .5559431 red-F.G 673 94,8  
     
08-06-2021 At north side of dam 1: r-F.G and another chick at the blocks (is this maybe r-F.F?).
     
26-06-2021 No visit.