Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinator:
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse

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Herring Gull argentatus K.6 1CY-2CY, May 2021 & February 2022, De Kreupel & Medemblik, the Netherlands. Picture: Leon Kelder & Renate Visscher.

Red tibia ring r[K.6], ringed as pullus Larus argentatus on May 14 2021 at nest M06 21 in colony De Kreupel, the Netherlands.
ID is uncertain: both parents are unknown. Preliminary ID based on sandy plumage of pulli.

Tibia R-K6 and metal NLA 5.556.740, ringed as pullus Herring Gull (Larus argentatus) on 14-5-2021 at IJsselmeer (De Kreupel), Holland (5247.00 N 513.00 E). Ringer Leon Kelder.

Recoveries:
28-09-2021 Den Oever (Buitenhaven), Noord-Holland, NL 5.256,00 N 502,00 E colourring read Bert Winters
23-10-2021 Den Oever (Buitenhaven), Noord-Holland, NL 5.256,00 N 502,00 E colourring read Bert Winters
19-12-2021 Den Oever (Buitenhaven), Noord-Holland, NL 5.256,00 N 502,00 E colourring read Jan Willem Dekker
24-02-2022 Wieringermeer (Zuiderdijkweg), Noord-Holland, NL 5.246,00 N 506,00 E colourring read Renate Visscher

below: Herring Gull argentatus K.6 2CY, February 24 2022, gemaal Lely - Medemblik, the Netherlands. Picture: Renate Visscher.

below: Herring Gull argentatus K.6 1CY, May 14 2021, De Kreupel - M, the Netherlands. Picture: Leon Kelder.

Date: details:          
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 67.9 49.5
  B egg 65.1 48.8
  C egg 71.4 50.2    
Attempt to trap breeding adult. Failed.          
           
14-5-2021 2 pulli & 1 hatching egg in nest. metal: tibia: mass (gr): head + bill: tarsus:
https://waarneming.nl/observation/214664240/ NLA 5.556.739 r-K.5 66 49.0 28.9
  NLA 5.556.740 r-K.6 72 49.8 28.2
         
20-5-2021 1 pullus present. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Rounded Goby 1x; Black-headed Gull pull 2x NLA 5.556.739 r-K.5 153 60.8  
https://waarneming.nl/observation/214907849/          
           
28-5-2021 No chicks present. Many prey left-overs.          
https://waarneming.nl/observation/215271016/          
             
11-6-2021 Camera trap: 1 pullus & 1 adult. https://waarneming.nl/observation/224226687/