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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Nests at Lelystad 2022
nest y-PNED
nest y-PHSV / r-CG
nest y-P:U60
nest y-X56A
nest y-X71A
nest y-X540
nest y-XCHP
nest w-327:U
nest n-F|N
nest r-6A
nest r-6B
nest r-6C
nest r-CS
nest r-FC
nest w-8Z
nest zy-MT
nest 003
nest 011
nest 012
nest 014
nest 015
nest 017
nest 017B
nest 018
nest 019
nest 021
nest 026
nest 034
nest 035
nest 038
nest 040
nest 044
nest 046
nest 048
nest 053
nest 055
nest 058
nest 060
nest 061Z
nest 062
nest 063
nest 107Z
nest 109
nest 111
nest 112
nest 113
nest 117Z
nest 118Z
nest 123Z
nest 124Z
nest 125Z
nest 126Z
nest 127Z
nest 128Z
nest 129Z
nest 131Z
nest 132 YLG
nest 133
nest 134
nest 135
nest 136
nest 137
nest 138
nest 139
nest 143Z
nest 203
nest 204
nest 207
nest 222Z
nest 227
nest 228Z
nest 229
nest 230Z
nest 231
nest 240Z
nest 244
nest 245Z

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

Caspian Gull cachinnans F.C adult, May 2021 - July 2024, the Netherlands. Picture: Albert de Jong, Roland-Jan Buijs, Thijs Horst & Mars Muusse.

Tibia R-FC and metal 6.213.012, ringed as adult male Caspian Gull Larus cachinnans on May 28 2021 at nest 43 in colony Lelystad, the Netherlands.

Recoveries:
01-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Mars Muusse
04-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
17-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Mars Muusse
13-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
19-07-2024 IJsselmeer (De Kreupel), Noord-Holland, NL 5.247,00 N 513,00 E colourring read T. Horst & M. Muusse

Visits and data:

date:                  
28-05-2021 Decided to put out a cage to trap a breeding adult here. Successful. Adult male cachinnans trapped today.
  2 eggs in nest.              
  egg no: width (mm) length (mm) volume (cm3):  water test on May 28th:         
  A egg 74,5 50,4 95,28 90 - floating 2 mm        
  B egg 66,4 46,5 72,29 90 - floating 2 mm        
  sum nest: --          
  metal tibia mass (gr) head + bill (mm) wing (mm) tarsus (mm) bill (mm) gonys (mm)
  adult .6213012 r-F.C 1332 135,6 464 71 66 19,3
   
08-06-2021 2 partners at nest. male guarding at blocks. Large female at nest. 3 meters to the west is LBBG nest (also behind trunk).
   
    metal tibia mass (gr) head + bill (mm) wing (mm)  
26-06-2021 pullus .5550699 r-F.3 714 98,3 151 cachinnans
  pullus .5550700 r-F.4 466 87,2 110 cachinnans

below: Caspian Gull cachinnans F.C adult, July 19 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F.C adult, February 13 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans F.C adult, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong, Roland-Jan Buijs & Mars Muusse.

Bird with broad black medial band on P10 (too broad for pure cachinnans?).