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 5.K 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[5.K] and metal NLA 5.625.108, ringed as pullus Larus cachinnans at nest 21 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID in 2022 uncertain. One parent is Caspian Gull, other parent not photgraphed.

Visits and data 2022:
Estimation egg laying: A-egg = April 6 2022??? Estimating hatching = May 4 2022.

11-04-2022 Nest is ready, still no eggs.        
               
12-04-2022 From distance: adult guarding nest.        
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A-egg 50,7 70,1 -- 20 - tip on bottom    
  B-egg 51,4 67,9   10 - tip on bottom  
sum nest: --
White jerrycan placed next to nest.  
   
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg -- --   3 mm - floating    
  B-egg -- --   2 mm - floating  
  C-egg 49,3 65,3   80 - tip on bottom
   
09-05-2022 From distance: adult at nest. Picture: bird has extra mirror, on P8.
   
17-05-2022   metal darvic mass wing H+B
pullus NLA 5.625.108 r-5.K 118    
pullus NLA 5.625.109 r-5.J 189    
               
17-06-2022 From distance: several larger chicks between blocks at this locations. No rings read, unfortunately.
       
21-06-2022 From distance: no activities at nest. No rings read, unfortunately.

r[5.K] cachinnans from nest 21. Picture: May 17th, 2022.
Ringed on May 17th and not recorded since, although several chicks present on June 17th, maybe including this chick. Same for sibling r[5.J].