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 FS 1CY, May -June 2021, De Kreupel - C, the Netherlands. Picture: Leon Kelder.

Pale blue tibia ring p[FS], ringed as pullus on May 14 2021 at nest C06 21 in colony De Kreupel island C, the Netherlands.
ID uncertain: 1 parent seems to be Herring Gull argentatus-type, other parent is unknown.

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

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

Date: details:          
           
14-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: tarsus:
  Prey: 1x Roach; 2x Eel. NLA 5.556.713 Pale FR 92 54.6 31.9
  https://waarneming.nl/observation/214662060/ NLA 5.556.714 Pale FS 106 56.8 33.3
    NLA 5.556.715 Pale FT 76 51.3 29.1
   
20-5-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
  Prey: 1x Roach; 1x Rounded Goby. NLA 5.556.713 Pale FR 313 71.1 52.0
  https://waarneming.nl/observation/214706998/ NLA 5.556.714 Pale FS 296 72.4 57.5
    NLA 5.556.715 Pale FT 207 67.0 --
             
11-6-2021 3 chicks in nest. metal: tibia: mass (gr): head + bill: wing:
  Prey: 4x Roach & 1x Perch (vomited) NLA 5.556.713 Pale FR 1094 117.0 278.5
  https://waarneming.nl/observation/216984901/  NLA 5.556.714 Pale FS 917 113.4 277.5
    NLA 5.556.715 Pale FT 1104 114.7 253.0