Larus cachinnans in the Netherlands

(last update: August 16, 2020)

Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse

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Lelystad 2021
nest y-PNED
nest y-PLDP
nest y-PHSV
nest y-P:A02
nest y-P:U60
nest zy-MT
nest r-FB
nest r-FC
nest 001
nest 003
nest 006
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016B
nest 017
nest 018
nest 019
nest 021
nest 034
nest 035
nest 038
nest 040
nest 041
nest 042
nest 044
nest 045
nest 046
nest 047
nest 048
nest 053
nest 055
nest 056
nest 058
nest 060
nest 062
nest 063
nest 065
nest 066
nest 067
nest 072

Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY-2CY, May 2021 - January 2022, Almere-Lelystad, the Netherlands.

Hybrid, ringed as pullus Caspian Gull cachinnans x Herring Gull argentatus.
ID certain, father is adult Caspian Gull and mother is Herring Gull in nest 34. Brother/sisters are b-F|8 and b-F|9.

Visits and data.

date:        
24-03-2021 2 adults at this location.
         
06-05-2021 2 adults guarding at blocks. Red flag "71" placed to mark location.
  egg no: width (mm) length (mm) volume (cm3):  water test on May 6th:  
  A 50,7 74,5 96,42 90 - tip at bottom.  
  B 50,3 70,3 89,56 90 - tip at bottom.  
  C 50,4 71,1 90,93 90 - tip at bottom.  
      sum nest: 276,91    
   
13-05-2021 no visit, Camilla is trapping a Spoonbill.
         
15-05-2021 nest with 3 eggs. Flag put up again, for it was not visible.
         
    metal ring plastic head + bill:    
28-5-2021 pullus .5559422 b-F|8 64    
  pullus .5559423 b-F|9 52    
  pullus .5559424 b-F|+ 62    
         
08-06-2021 1 adult at this location.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 2CY, January 17 2022, Almere, the Netherlands. Picture: Mars Muusse.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY, October 30 2021, Almere, the Netherlands. Picture: Eric Roeland.

Much resembling Herring Gull, but ill-defined notches on tertials and rather dark outerwebs on inner primaries.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY, October 29 2021, Almere, the Netherlands. Picture: Thijs Horst.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY, October 23 2021, Almere, the Netherlands. Picture: Eric Roeland.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY, October 19 2021, Almere, the Netherlands. Picture: Eric Roeland.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY, October 15 2021, Almere, the Netherlands. Picture: Eric Roeland.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|+ 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong.