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 KE 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 "L". Nest coded "L03" in season 2021, but renamed after trapping adult, now coded as ring code.
partner 1: April 23rd, 2021: Caspian Gull cachinnans hybrid r-K.E (more images).
 

Visits and data.

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 47.7 68.4
  B egg 49.3 72.4
  C egg 48.2 67.9
         
Attempt to trap breeding adult. Adult trapped. metal: tibia: wing: head + bill: bill:
Adult male Herring x Caspian Gull hybrid type. NLA 6.211.440 Red-K.E 448.0 119.2 54.5
  mass: moult score: bill height: grey scale: Swob:
  840 10x0 17.3 7 1081
           
14-5-2021 No trace of pulli, nest is empty.          
         
20-5-2021 No trace of pulli, nest is empty.