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.L 1CY, May - October 2022, the Netherlands & Denmark. Picture: Lasse Nabe-Nielsen, Mars Muusse & Thijs Horst.

Red tibia ring r[C.L] and metal NLA 5.625.062, ringed as pullus Larus cachinnans at nest 12 on May 09 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID uncertain in 2022: one parent is unknown, other is partner 2 (same as 2021) and is cachinnans.

Visits and data:
Estimation egg laying: A-egg = April 01 2022. Estimating hatching = April 29 2022.

date:  
12-04-2022 2 adults at nest site.
15-04-2022 egg no: width (mm) length (mm) volume (cm3):  water test on April 15th:  
  A 47,2 76,3 -- 90 - float halfway 3 eggs.
  B 52 75,4 -- 3 mm - float  
  C 51,3 75,4 -- 90 - float halfway  
      sum nest: --    
29-04-2022 egg no:       water test on April 29th:  
  A       6 mm - float 3 eggs.
  B       6 mm - float  
  C       6 mm - float  
09-05-2022   metal darvic 3 pulli, 7 days old    
  pullus 5.625.062 r-C.L      
  pullus 5.625.063 r-C.M      
  pullus 5.625.064 r-C.N      
17-06-2022 2 adults at nest site.
21-06-2022 r-CL, r-CM, r-CN photographed. Healthy juveniles, all 3 flying around.
28-06-2022 r-CL, r-CM, r-CN photographed. Healthy juveniles, all 3 flying around.

below: Caspian Gull cachinnans C.L 1CY, June 28 2022, Fanø, Region Syddanmark, Denmark. Picture: Lasse Nabe-Nielsen.

Freshly dead - less than a week, found at Fanø, Denmark (55°20'23.97''N 8°27'45.65''E).

below: Caspian Gull cachinnans C.L 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.

r[C.L] cachinnans from nest 12. Picture: June 28th, 2022.
Sibling r[C.M] & r[C.N] also fledged from this nest.

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

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