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 K.M 1CY, May - June 2021, De Kreupel - E, the Netherlands. Picture: Leon Kelder.

Originally: Red tibia ring r[K.M], ringed as pullus Larus cachinnans on May 14 2021 at nest D07 in colony De Kreupel, the Netherlands.
This bird was found dead on May 20th. Then rings have been recycled in a neighbouring nest.

Recycled ring, now used in nest E01.
Red tibia ring r[K.M], ringed as pullus Larus cachinnans on May 20 2021 at nest E01 21 in colony De Kreupel, the Netherlands.
ID is uncertain: both parents are unknown.

below: Caspian Gull cachinnans K.M 1CY, June 11 2021, De Kreupel - D, the Netherlands. Picture: Leon Kelder.

below: Caspian Gull cachinnans K.M 1CY, May 20 2021, De Kreupel - D, the Netherlands. Picture: Leon Kelder.

Date: details:          
14-5-2021 2 pulli in nest.        
           
20-5-2021 2 pulli in nest. Ring r-K.M & metal reused here. metal: tibia: mass (gr): head + bill: .
Prey: Roach 2x; Eel 1x. NLA 5.556.756 b-D|V 135 57.5 32.4 = tarsus
https://waarneming.nl/observation/214708690/ NLA 5.556.720 r-K.M 334 76.1 60.5 = wing
         
11-6-2021 2 pulli in nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216987573/ NLA 5.556.756 b-D|V 654 94.0 160.0
    NLA 5.556.720 r-K.M 1104 119.9 289.5
             
2-7-2021 1 chick near nest. metal: tibia: mass (gr): head + bill: wing:
  NLA 5.556.756 b-D|V 914 116.0 331.0

below: Caspian Gull cachinnans K.M 1CY, May 14 2021 (dead on May 20th), De Kreupel - D, the Netherlands. Picture: Leon Kelder.

Red tibia ring r[K.M], ringed as pullus Larus cachinnans on May 14 2021 at nest D07 in colony De Kreupel, the Netherlands.
This bird was found dead on May 20th. Then rings have been recycled in a neighbouring nest E01 (see above).
ID certain, both parents are Caspian Gull cachinnans.

Date: details:          
           
23-4-2021 3 eggs in nest. egg no: width (mm): length (mm): volume (cm3): 
  A egg 49.1 68.3
  B egg 48.8 70.6
Attempt to trap breeding adult. Failed. C egg 49.7 70.7
         
14-5-2021 3 pulli in nest. metal: tibia: mass (gr): head + bill: tarsus:
Prey: Roach / Rudd spec. 2x NLA 5.556.719 Red K.L 73 48.6 27.3
https://waarneming.nl/observation/214662857/ NLA 5.556.720 Red K.M 80 53.5 29.8
NLA 5.556.721 Red K.N 96 53.6 29.2
           
20-5-2021 2 chicks & 1 dead chick (recent, r-K.M). metal: tibia: mass (gr): head + bill: tarsus:
Red K.M & metal 5556720 will be reused. NLA 5.556.719 Red K.L 217 64.8  
  NLA 5.556.720 Red K.M 96 61.6  
NLA 5.556.721 Red K.N 271 70.7  
  Camera trap near nest: 2 pulli & 2 unringed adults.          
  https://waarneming.nl/observation/223638304/          
   
11-6-2021 1 chick near nest. metal: tibia: mass (gr): head + bill: wing:
  https://waarneming.nl/observation/216985629/  NLA 5.556.721 Red K.N 880 109.5 271.0