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 5.M 1CY, May - June 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[5.M] and metal NLA 5.625.110, ringed as pullus Larus cachinnans at nest 40 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID certain, both female and male are Caspian Gull cachinnans.

Visits and data 2022 for nest 40:
Estimation egg laying: A-egg = April 12 2022. Estimating hatching = May 10 2022.

    length (mm) width (mm) volume (cm3):  water test on April 15th:     
15-04-2022 A egg 69,9 49 -- --    
  B egg 69 49,6 -- --    
               
19-04-2022 Sub-adult cachinnans n-F|6 is curious and lands on blocks near nest. Fiercy chased away by huge male cachinnans from nest 40. Female is also Caspian.
               
    length (mm) width (mm) volume (cm3):  water test on April 27th:     
27-04-2022 A egg     -- 3 mm - floating    
  B egg     -- 3 mm - floating    
  C egg 67,2 49,5 -- 3 mm - floating    
   
04-05-2022 From distance: male cachinnans circles over nest and lands on lighthouse as lookout post.
   
17-05-2022 From distance: female cachinnans circles over nest few times.
    metal darvic mass      
  pullus NLA 5625110 r-5M 200      
  pullus NLA 5625111 r-5L 136      
   
17-06-2022 From distance: both cachinnans parents near nest, with 3 chicks. Of course, one is unringed..
  r-5M and r-5L can fly around, pretty well.
   
21-06-2022 r-5M and r-5L and their unringed sibling fly around and swim on west side of nest, near yellow buoy.
   
28-06-2022 male cachinnans near nest.

below: Caspian Gull cachinnans 5.M 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[5.M] cachinnans from nest 40. Picture: June 21st, 2022.
Fledged. Sibling r[5.L] and unringed chick from nest 40 also fledged.

below: Caspian Gull cachinnans 5.M 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.