Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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Caspian Gull cachinnans F|W 1CY-2CY, May 2021 - January 2022, Lelystad, Almere & Enkhuizen, the Netherlands. Picture: Eric Roeland, Jeroen Nagtegaal, Albert de Jong & Mars Muusse.

Ringed as pullus Larus cachinnans on May 28 2021 at nest 58 in colony Lelystad, the Netherlands.
ID uncertain in 2021, one is 4CY-type and match pure Caspian Gull cachinnans. Other is 5CY uncertain cachinnans, with "hybrid type" P10 pattern and bill shape rather bulbous.

Visits and data.

date:            
24-04-2021 One partner is sub-adult. Nest allows trapping breeders, easily. 3 eggs in nest.
  egg no: width (mm) length (mm) volume (cm3):  water test on April 24th:   
  A egg 46,2 75,3 80,92 60 - tip bottom  
  B egg 48,3 73,7 86,57 35 - tip bottom  
  C egg 48,9 72,9 87,77 25 - tip bottom  
  sum nest: 255,26    
   
26-04-2021 Breeding bird is moulting sub-adult (4CY). Also 5CY present on bread, but really bird of nest 58?
   
13-05-2021 Partner 2 is 5CY bird! 4CY also patrolling over nest. 5CY bird chasing neighbour Lesser Black-backeds.
  3 eggs just hatching.
   
15-05-2021 C egg with small cracks, will hatch soon.
  1 hatched chick, still wet, hatched this morning.
  1 hatched chick (1 day old). Mass = 66 gr.
   
28-05-2021   metal tibia mass head + bill  
  pull .5559407 b-F|V >400 82,8  
  pull .5559408 b-F|W >400 84,4  
   
08-06-2021 2 partners at nest. Chasing neighbouring Lesser Black-backeds.
   
26-06-2021 No activity.

below: Caspian Gull cachinnans F|W 2CY, January 23 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans F|W 1CY, September 04 2021, Enkhuizen, the Netherlands. Picture: Jeroen Nagtegaal.

below: Caspian Gull cachinnans F|W 1CY, July 19 2021, Almere, the Netherlands. Picture: Eric Roeland.

Still in full juvenile plumage.

below: Caspian Gull cachinnans F|W 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong & Mars Muusse.