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

Red tibia ring r[5.W] and metal NLA 5.625.121, ringed as pullus Larus cachinnans at nest 112 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
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 112:
Estimation egg laying: A-egg = April 3 2022. Estimating hatching = May 1 2022.

date:              
12-04-2022 adult near nest.  
               
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 50,5 72,5 -- 50 - tip bottom 3 eggs  
  B 48,3 64,9 -- 70 - tip bottom  
C 51 71,7 -- 90 - tip bottom
sum nest: --
   
  egg no:     3 eggs, 1 adult has short white tongue on P10: hybrid?    
29-04-2022 A float - 4 mm          
  B float - 4 mm        
C float - 5 mm    
   
01-05-2022 Cach and hybrid type at nest.
   
04-05-2022 Cach at nest.
   
  metal darvic mass H+B      
09-05-2022 .5625057 r-C.F -- --
17-05-2022 .5625121 r-5W 515 85,9
17-05-2022 .5625122 r-5X 618 94,9
17-06-2022 No activity.
21-06-2022 No activity.
28-06-2022 r-CF 7 r-5W pictures. All chicks fledged: 3 out of 3.

below: Caspian Gull cachinnans 5.W 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[5.W] cachinnans from nest 112. Picture: June 28th, 2022.
Fledged. Sibling r[5.X] and sibling r[C.F] also fledged: 3 out of 3.

below: Caspian Gull cachinnans 5.W 1CY, June 17 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

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