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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Caspian Gull cachinnans 201:U 6CY, May 20 2021, De Kreupel - L, the Netherlands. Picture: camera trap.

You can participate in this project too! Please send in your observations of colour ringed birds to: ring@buijsecoconsult.nl

Coordinator: Leon Kelder.
Ringers: Roland-Jan Buijs, Leon Kelder & Merijn Loeve.

White 201:U was observed in the Netherlands in it's first winter, but was also recorded back in Czechia in 3rd winter.
Nonetheless, it decided to start breeding in the recently established colony De Kreupel, in the Netherlands, as breeder of nest 201U 21 at island D, temporarily nest coded D04.

Ring data:
White ring 201:U and metal CZP CX1348, ringed as pullus Larus cachinnans on May 27 2016 at Pasohlávky, Jihomoravský kraj, Czechia (48°53'49"N 16°36'4"E) - ringer František Zicha.

Recoveries:
2017-01-20, Hazepad, Breda, Noord-Brabant, The Netherlands | 51.618516; 4.768643 | 893 km | Jeroen Nagtegaal
2017-03-31, Zwenkauer See, Zwenkau, Leipzig, Germany | 51.233333; 12.316667 | 401 km | Andreas Krüger
2017-04-06, Haselbacher Teiche, Haselbach, Thüringen, Germany | 51.073333; 12.444167 | 383 km | Steffen Wolf
2019-12-13, vodní nádrž Modlany, (Modlany), Ústecký kraj, Czechia | 50.650827; 13.882856 | 276 km | Václav Beran
2021-05-20, Island De Kreupel, Enkhuizen, Noord-Holland, The Netherlands | 52.798673 5.22688 | 907 km | Leon Kelder
2021-05-24, Noorderkwelweg, Den Oever, Noord-Holland, The Netherlands | 52.897; 5.038 | 923 km | Fred Visscher

Nest data for nest 201U-21:

Date: details:            
           
23-4-2021 1 egg in nest. egg no: width (mm): length (mm): volume (cm3): 
Attempt to trap breeding adult. Failed. A egg 50.6 73.8
           
14-5-2021 2 eggs in nest.        
2 adults near nest. One ringed w[201:U].      
https://waarneming.nl/observation/214662645/            
           
20-5-2021 1 egg hatching & 1 chick. metal: tibia: mass (gr): head + bill: tarsus:  
Prey: 1x Roach. NLA 5.556.757 b-D|0 75 48.6 27.8  
https://waarneming.nl/observation/214707336/            
  Camera trap near nest: 1 pullus & 2 adults.            
  https://waarneming.nl/observation/223648760/            
   
28-5-2021 2 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Unringed male Caspian & w[201:U] female Caspian. NLA 5.556.757 b-D|0 231 66.7 41.6  
    NLA 5.556.771 r-B.2 168 61.2 36.2