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

Red tibia ring r[5.U] and metal NLA 5.625.120, ringed as pullus Larus cachinnans at nest 19 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID certain, both parents are Caspian Gull cachinnans.

r[5.U] cachinnans from nest 19. Picture: May 17th, 2022.
Ringed on May 17th, and not recorded since. Same for sibling r[5.V]. No confirmation on 3rd egg in nest.

Visits and data 2022 for nest 19:
Estimation egg laying: A-egg = April 03 2022. Estimating hatching = May 01 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 49,8 68,3 -- 90 - tip bottom 3 eggs  
  B 50,4 69 -- 90 - tip bottom  
C 48,2 68,1 -- 90 - tip bottom
sum nest: --
   
19-04-2022 3 birds present: including female w-327:U without nest.
   
27-04-2022 A -- -- -- 3 mm - floating 3 eggs  
  B -- -- -- 3 mm - floating  
C -- -- -- 4 mm - floating
parent 1 = cachinnans.  
   
01-05-2022 2 parents at nest.  
   
04-05-2022 male = cachinnans.  
   
09-05-2022 Nest is empty, no chicks found, but much shit; the chicks hide in Blackberry complex.
   
    metal darvic mass H+B    
17-05-2022 pullus 5.625.119 r-5V 404 80,5    
  pullus 5.625.120 r-5U 464 82,5  
         
   
17-06-2022 No birds present.
   
21-06-2022 No activity at nest.