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 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

Caspian Gull cachinnans hybrid 7.G 1CY-3CY, May 2022 - May 2024, Lelystad & Almere, the Netherlands. Picture: Thijs Horst, Harry Kuipers, Mars Muusse & Eric Roeland.

Red tibia ring r[7.G] and metal NLA 5.625.188, ringed as pullus Larus cachinnans hybrid at nest 034 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Albert de Jong - Roland-Jan Buijs ringing team.
ID uncertain, one parent is Caspian Gull cachinnans, other parent not photographed, maybe female Herring Gull argenteus.

Recoveries:
17-08-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
19-08-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst & Maarten Hotting
11-09-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
23-09-2022 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Thijs Horst
24-09-2022 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
27-01-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
10-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
05-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
17-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
31-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
09-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
19-10-2023 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Thijs Horst
29-11-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
01-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
16-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
18-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
30-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Harry Kuipers & Thijs Horst
31-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse

Bird from nest 034, visits and data 2022 (coded 130 on bitumen in 2022):
Estimation egg laying: A-egg = April 20 2022. Estimating hatching = May 18 2022.

    length (mm) width (mm) volume (cm3):  water test on April 27th:     
27-04-2022 A egg 70,9 48,3 -- 20 gr - tip bottom    
  B egg 73,6 50,3 -- 40 gr - tip bottom    
  C egg 73 49,2 -- 40 gr - tip bottom    
One parent is cachinnans (partner 1)  
   
17-05-2022 female Herring Gull argenteus next to nest.
  A egg: in tact.
  C egg: with small hole.
  B egg: hatched
   
    metal darvic mass wing H+B bill
30-05-2002 pullus NLA 5625188 r-7.G 454 80 79,9 33,2
One pullus dead in nest.
 
28-06-2022 image of r-7G. Together with female Herring gull and sibling (unringed).
 
12-07-2022 image of r-7G.
   
17-07-2022 image of r-7G.

below: Caspian Gull cachinnans hybrid 7.G 3CY, May 05 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 3CY, March 30 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 3CY, March 30 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Harry Kuipers.

below: Caspian Gull cachinnans hybrid 7.G 3CY, January 18 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 3CY, January 16 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 3CY, January 12 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 2CY, November 29 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid 7.G 2CY, October 19 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid 7.G 2CY, April 09 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Note dark outerwebs on inner primaries.

below: Caspian Gull cachinnans hybrid 7.G 2CY, March 17 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 2CY, February 10 2023, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans hybrid 7.G 2CY, January 27 2023, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans hybrid 7.G 1CY, September 11 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans hybrid 7.G 1CY, August 19 2022, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 7.G 1CY, August 17 2022, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid 7.G 1CY, July 17 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Unusual dark bird. Will be interesting to follow the plumage development over the coming years.

below: Caspian Gull cachinnans hybrid 7.G 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Dark bird with notching on many coverts and tertials, which may be an indication for Herring Gull inheritance.

below: Caspian Gull cachinnans hybrid 7.G 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[7.G] cachinnans from nest 034. Picture: June 28th, 2022.
Fledged. 1 dead chick in nest on May 30th. No confirmation on 3rd egg, but image below suggests: 2 chicks fledged from this nest.

Female in the back is probably mother of r-7.G.

below: Caspian Gull cachinnans hybrid 7.G 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.