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 KH 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 "C". Nest coded "C01" in season 2021, but renamed after trapping adult, now coded as ring code.
location April 9th, 2021. April 9th, 2021: 1 egg. April 9th, 2021: 1 egg.
 
partner 1: June 11th, 2021: adult r-K.H (more images). . .
     

Visits and data.

Date: details:            
    egg no: width (mm): length (mm): volume (cm3): 
9-4-2021 1 egg in nest, cold.
https://waarneming.nl/observation/210431816/
A egg 52.0 73.0  
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
    B egg 52.9 74.2
    A egg 52.0 73.0
  C egg 51.2 70.0
metal: tibia: wing: head + bill: bill:  
Adult male trapped at nest. NLA 6.211.442 Red-K.H 475.0 139.3 61.2  
    mass: tarsus: moult score: bill height: grey scale Swob
    1258 78.6 10x0 16.2 6 1084
   
14-5-2021 Nest empty, no sign of chicks.