Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Leon Kelder
Mars Muusse

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Cachinnans - nest Lelystad 067

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 067 positioned at breakwater dam 2, only 3 meters west of nest 18, marked with red flag.
  • ID certain: partners are cachinnans, one bird is 4CY and one is adult.
location May 13th, 2021. . .
     
partner 1 May 13th, 2021: adult cachinnans. May 13th, 2021: adult cachinnans. .
   
partner 2 May 6th, 2021: 4CY cachinnans. . .
     

Visits and data.

date:            
  egg no: width (mm) length (mm) volume (cm3):  water test on April 16th:   
06-05-2021 A 47,5 77,4 87,93 15 - flat on bottom  
  B 47,6 69,8 79,63 15 - flat on bottom  
  Adult and 4CY cachinnans patrolling near nest.
             
13-05-2021 Adult cachinnans patrolling and alarming.
   
15-05-2021 3 eggs, complete. No scratches.
   
28-05-2021 3 eggs.
   
08-06-2021 No cachinnans present today. Herring Gull occupies block in front of nest.
   
26-6-2021 Not activities here.