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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Caspian Gull cachinnans C.V 1CY & 4CY, 2022-2025, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[C.V] and metal NLA 5.625.070, ringed as pullus Larus cachinnans at nest 17B on May 09 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain in 2022, both parents are Caspian Gull cachinnans.

Recoveries:
17-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
30-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
07-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-04-2025 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse
10-04-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst

Visits and data 2022
Estimation egg laying: A-egg = April 08 2022. Estimating hatching = May 06 2022.
                 
15-04-2022 A egg 68,1 50,4 tip bottom - 40 2 blue eggs.      
  B egg 65,6 49,7 tip bottom - 40        
  C egg 68,7 50,6 tip bottom - 40        
   
19-04-2022 2 parents present at nest.
   
29-04-2022 A egg     float - 1 mm        
  B egg     float - 1 mm        
  C egg     float - 1 mm        
   
01-05-2022 female is cachinnans.
   
09-05-2022 pullus r-C.V   NLA 5625070        
  pullus r-C.W   NLA 5625071        
  pullus --   NLA 5625072 pullus too small for plastic.
   
    colour   metal mass wing head + bill bill
17-05-2022 pullus r-C.V   NLA 5625070 257      
   
30-05-2022 pullus r-C.V   NLA 5625070 615 175 95,1 39,3
  food: fish is Roach
   
02-06-2022 male alarming.
   
17-06-2022 No birds near nest, r-CW flying around at north side.
   
21-06-2022 No activities near nest, r-CV & r-CW & 3rd chick (only mmetal?) swimming at north side. If so, then 3x chicks fledged from this nest.
   
12-07-2022 R-CV & r-CW photographed.
                 
17-05-2022 R-CW photographed.

below: Caspian Gull cachinnans C.V 4CY, April 08 2025, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans C.V 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans C.V 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[C.V] cachinnans from nest 17B. Picture: June 21st, 2022.
Fledged. Sibling r[C.W] also fledged. Unringed bird in the group is probably 3rd sibling from nest 17B, also fledged.

below: Caspian Gull cachinnans C.V 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

below: Caspian Gull cachinnans C.V 1CY, May 09 2022, Lelystad, the Netherlands. Picture: Mars Muusse.