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 7.E 1CY, May - June 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[7.E] and metal NLA 5.625.117, ringed as pullus Larus cachinnans at nest 26 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
ID certain, both parents are Caspian Gull cachinnans.

Visits and data 2022 for nest 26:
Estimation egg laying: A-egg = April 15 2022. Estimating hatching = May 13 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):       
15-04-2022 A 48,7 72,0 --   1 egg.  
sub-adult Caspian near nest.
     
19-04-2022 sub-adult Caspian near nest.  
   
  egg no: 3 eggs.        
27-04-2022 A - - tip bottom - 90      
  B 49,6 70,2 tip bottom - 70    
C 50,0 72,5 tip bottom - 90
               
    metal          
17-05-2022 pullus 5625117 2 days old.        
  pullus 5625118          
1x egg: infertile.  
   
    metal colour mass wing head + bill Bill
30-05-2022 pullus 5625117 r-7.E 612 126 95,7 38,1
  pullus 5625118 r-7.F 522 96 88,2 36,6
1x egg: infertile.  
   
02-06-2022 r7E & r7F present.
   
17-06-2022 r7E & r7F present.
   
21-06-2022 r7E & r7F present
   
28-06-2022 r7E & r7F present
   
12-07-2022 r7E & r7F present
  Male cachinnans 4CY & female cachinnans.

below: Caspian Gull cachinnans 7.E 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[7.E] cachinnans from nest 26. Picture: May 30th, 2022.
Fledged. Sibling r[7.F] also fledged. 3rd egg infertile.