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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Cachinnans - nest Lelystad 128Z

General remarks:

  • Eggs: Volume measured by Stonehouse (1964) and Spaans & Spaans (1975), which make comparison possible with data from Texel (Camphuysen pers comm 16.04.2020).
  • Nest 128Z positioned on dam 1 south, 20 meters east of nest 60. Part of "control group Herring Gulls".
  • ID certain in 2022: both adults are Herring Gull.
location April 27th, 2022: location of nest. April 27th, 2022: 3 eggs. May 4th, 2022: 3 eggs.
 
  May 22nd, 2022: hatching C-egg. May 30th, 2022: chick r[7.C]. May 30th, 2022: juvenile r[7.C].
 

Visits and data:
Estimation egg laying: A-egg = April 24 2022. Estimating hatching = May 22 2022.

date:              
  egg no: width (mm): length (mm): volume (cm3):  water test    
27-04-2022 A-egg 49,7 73,5 -- tip bottom - 20 gr  
  B-egg 51,1 73,4   tip bottom - 0 gr
  C-egg 48,8 67,8 -- tip bottom - 0 gr
sum nest: --
     
04-05-2022 3 eggs  
   
09-05-2022 3 eggs
       
17-05-2022 3 eggs      
       
22-05-2022 C egg hatching, A & B chicks out of egg.    
       
30-05-2022 metal darvic mass wing H+B bill  
.5625184 r-7.C 329 56 71,4 25,3  
   
12-07-2022 picture of r-7C.
   
17-07-2022 picture of r-7C.