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 K.N 1CY, May 14-20 & June 11 2021, De Kreupel - D, the Netherlands. Picture: Leon Kelder.

Red tibia ring r[K.N], ringed as pullus Larus cachinnans on May 14 2021 at nest D07 in colony De Kreupel, the Netherlands.
ID certain, both parents are Caspian Gull cachinnans.

below: Caspian Gull cachinnans K.N 1CY, May 14 2021, De Kreupel - D, the Netherlands. Picture: Leon Kelder.

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

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

Suspicious pattern on outerweb of P2-P3, lack of extensive dark centres on outer GC, and fairly stubby and high bill may suggest influence of Herring Gull, but both parents known, and match pure Caspian Gull.

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