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 De Kreupel D03 21

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 on island "D". Nest coded "D03" in season 2021, but renamed after trapping adult, now coded as ring code.
eggs: May 14th, 2021.    
     

Visits and data.

Date: details:            
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 49.4 72.2
B egg 49.1 69.5
C egg 47.5 69.2
           
Attempt to trap adult at nest. Failed.            
   
14-5-2021 2 eggs & 1 dwarf-egg.          
  Reused by Lesser Black-backed Gull?          
  https://waarneming.nl/observation/214662579/          
             
20-5-2021 2 eggs & 1 dwarf-egg.          
               
28-5-2021 2 eggs & 1 dwarf-egg.