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 KJ 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 "C05" in season 2021, but renamed after trapping adult, now coded as ring code.
  • red K.J is hybrid type Herring Gull. Partner is Herring Gull argentatus.
partner 1: April 23rd, 2021: adult r-K.J (more images). July 30th, 2021: partner is Herring Gull. .
   
pulli: May 28th, 2021: pullus r[B.0]. . .
     
prey: May 28th, 2021: Black-headed Gull pullus. . .
     

Visits and data.

Date: details:            
           
23-4-2021 1 egg in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 50.6 77.0
metal: tibia: wing: head + bill: bill:  
Adult trapped at nest: hybrid Caspian x Herring Gull.. NLA 6.211.443 Red-K.J 455.0 127.3 59.7  
    mass: tarsus: moult score: bill height: grey scale Swob
    1156 70.3 10x0 20.0 4 1085
   
14-5-2021 3 eggs in nest.          
             
20-5-2021 2 eggs in tact, 1 egg is hatching.          
             
28-5-2021 1 egg & 1 chick in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Prey: Black-headed Gull pullus. NLA 5.556.769 Red B.0 203 65.4 --  
  Unringed adult seems Herring Gull argentatus.            
  https://waarneming.nl/observation/215267487/            
   
30-7-2021 2 adults at sign pole. No chicks around.          
  https://waarneming.nl/observation/221541140/