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 C.J 1CY, May - July 2022, Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.

Red tibia ring r[C.J] and metal NLA 5.625.059, ringed as pullus Larus cachinnans at nest 111 on May 09 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain, parents are male Caspian Gull type (short tongue on P10 may indicate hybrid, otherwise nice cachinnans) and female Caspian Gull.

Visits and data 2022 for nest 111:
Estimation egg laying: A-egg = April 3 2022. Estimating hatching = May 1 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 53,2 71,7 -- 90 - tip bottom 3 eggs  
  B 52,6 72,5 -- 60 - tip bottom  
C 50,5 70,8 -- 70 - tip bottom
sum nest: --
   
  egg no:     3 eggs, 1 adult has short white tongue on P10: hybrid?    
27-04-2022 A float - 1 mm          
  B float - 1 mm        
C float - 3 mm    
  Cach and cachinnans type at nest.
   
04-05-2022 Cachinnans type male at nest.
   
  metal darvic mass H+B      
09-05-2022 .5625058 r-C.H -- --
09-05-2022 .5625059 r-C.J -- --
17-05-2022 .5625058 r-C.H 416 81,8
21-05-2022 r-CH & r-CJ and another unringed chick swimming and flying between the dams.
28-06-2022 r-CH & r-CJ photos.
17-07-2022 r-CH & r-CJ photos.

below: Caspian Gull cachinnans C.J 1CY, July 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.

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

r[C.J] cachinnans from nest 111. Picture: June 28th, 2022.
Fledged. Sibling r[C.H] also fledged and recorded together with r[C.J]. Unringed (possible) sibling also fledged.

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

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