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 FT 1CY-2CY, May 2021 - April 2022, De Kreupel & Almere, the Netherlands & Gijón, Spain. Picture: César Fernández González, Eric Roeland, Thijs Horst & Leon Kelder.

Pale blue tibia ring p[FT], 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. Still, picture June 2021 illustrates clear cachinnans influences.

Visits & data:

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

P-FT and metal NLA Arnhem 5.556.715, ringed as pullus Larus cachinnans on 14-05-2021 at IJsselmeer (De Kreupel), Holland (NL 5247.00 N 513.00 E) - ringer Leon Kelder.

Recoveries:
20-05-2021, IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
11-06-2021, IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E captured by ringer Leon Kelder
17-07-2021, IJmuiden (Forteiland), Noord-Holland, NL 5.228,00 N 434,00 E colourring read Fred Cottaar
22-07-2021, Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
04-08-2021, Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
13-10-2021, Gijón (Strand), Asturias, SPANJE 4.332,00 N 539,00 W colourring read César Fernández

below: Caspian Gull cachinnans FT 2CY, April 26 2022, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans FT 1CY, October 13 2021, Gijón, Asturias, Spain. Picture: César Fernández González.

In all respects resembling cachinnans.

below: Caspian Gull cachinnans F9 1CY, August 04 2021, Almere, the Netherlands. Picture: Eric Roeland.

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

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