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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Caspian Gull cachinnans 5.G 1CY, May 17 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

Red tibia ring r[5.G] and metal NLA 5.625.106, ringed as pullus Larus cachinnans at nest 108 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID certain in 2022: both immature (4CY) cachinnans, one trapped at the nest and ringed r[C.S].

Visits and data.

date:              
11-04-2022 nest ready. Still empty.
   
12-04-2022 2 birds at nest site.
               
  egg no: width (mm): length (mm): volume (cm3):  water test    
15-04-2022 A 48,1 70,9 -- --    
27-04-2022 A       float - 1 mm  
27-04-2022 B 67,9 47,7 -- 80 - tip on bottom
sum nest: --
   
04-05-2022 4CY at nest.
   
09-05-2022 4CY trapped at nest. Ring metal = NLA 5.625.067.
darvic gonys wing tarsus head+bill bill mass
r[C.S] 18,0 446 69,2 127,2 59,1 1025 gr.
17-05-2022   metal darvic mass
pullus NLA 5.625.106 r-5.G 151
pullus NLA 5.625.107 r-5.H 89
prey Roach & Eel (50 cm).

r[5.G] cachinnans from nest 108 with mother r[C.S]. Picture: May 17th, 2022.
Ringed on May 17th and not recorded since. Same for sibling r[5.H].