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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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

Caspian Gull cachinnans 5.L 1CY, May - June 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Red tibia ring r[5.L] and metal NLA 5.625.111, ringed as pullus Larus cachinnans at nest 40 on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Herman Bouman.
ID certain, both female and male are Caspian Gull cachinnans.

Visits and data 2022 for nest 40:
Estimation egg laying: A-egg = April 12 2022. Estimating hatching = May 10 2022.

    length (mm) width (mm) volume (cm3):  water test on April 15th:     
15-04-2022 A egg 69,9 49 -- --    
  B egg 69 49,6 -- --    
               
19-04-2022 Sub-adult cachinnans n-F|6 is curious and lands on blocks near nest. Fiercy chased away by huge male cachinnans from nest 40. Female is also Caspian.
               
    length (mm) width (mm) volume (cm3):  water test on April 27th:     
27-04-2022 A egg     -- 3 mm - floating    
  B egg     -- 3 mm - floating    
  C egg 67,2 49,5 -- 3 mm - floating    
   
04-05-2022 From distance: male cachinnans circles over nest and lands on lighthouse as lookout post.
   
17-05-2022 From distance: female cachinnans circles over nest few times.
    metal darvic mass      
  pullus NLA 5625110 r-5M 200      
  pullus NLA 5625111 r-5L 136      
   
17-06-2022 From distance: both cachinnans parents near nest, with 3 chicks. Of course, one is unringed..
  r-5M and r-5L can fly around, pretty well.
   
21-06-2022 r-5M and r-5L and their unringed sibling fly around and swim on west side of nest, near yellow buoy.
   
28-06-2022 male cachinnans near nest.

below: Caspian Gull cachinnans 5.L 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[5.L] cachinnans from nest 40. Picture: June 21st, 2022.
Fledged. Sibling r[5.M] and unringed chick from nest 40 also fledged.

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