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 KC 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 "M". Nest coded "M05" in season 2021, but renamed after trapping adult, now coded as ring code.
partner 1: April 23rd, 2021: adult Herring Gull r-K.C (more images). .
   
pulli: May 14th, 2021: pullus r[K.7]. May 20th, 2021: pullus NLA 5.556.763
 

Visits and data.

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  C egg 49.0 73.1
  A egg 48.9 70.3
B egg 49.7 73.9    
           
Attempt to trap breeding adult. Adult trapped. metal: tibia: wing: head + bill: bill:
Adult female Herring Gull argentatus. NLA 6.211.438 Red-K.C 427 119.4 51.8
  mass: moult score: bill height: grey scale: Tarsus: & Swob:
  -- left P1 missing 18.9 3.5 65.0 & 1079
           
14-5-2021 1 chick & 1 egg in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214664184/ NLA 5.556.741 r-K.7 68 48.6 28.3
           
           
20-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214711054/ NLA 5.556.741 r-K.7 200 64.5 --
  NLA 5.556.763 -- 91 54.2 32.2