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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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
24-11-2023 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Eric Roeland
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
03-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
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
30-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
31-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
30-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Maarten Hotting
05-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst

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.