Larus cachinnans in the Netherlands

(last update: August 16, 2020)

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

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Lelystad 2021
nest y-PNED
nest y-PLDP
nest y-PHSV
nest y-P:A02
nest y-P:U60
nest zy-MT
nest r-FB
nest r-FC
nest 001
nest 003
nest 006
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016B
nest 017
nest 018
nest 019
nest 021
nest 034
nest 035
nest 038
nest 040
nest 041
nest 042
nest 044
nest 045
nest 046
nest 047
nest 048
nest 053
nest 055
nest 056
nest 058
nest 060
nest 062
nest 063
nest 065
nest 066
nest 067
nest 072

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.