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 (hybrid) 6.L 1CY-4CY, June 2022 - March 2025, the Netherlands. Picture: Guus van Duin, Thijs Horst, Mars Muusse & Eric Roeland.

Red tibia ring r[6.L] and metal NLA 5.625.163, ringed as pullus hybrid Larus cachinnans at nest 139 on May 22 2022 in colony Lelystad, the Netherlands. Ringer: Jeroen Nagtegaal.
ID uncertain in 2022: one parent is adult cachinnans-type, other parent is adult argentatus-type. In 1st winter typical example sporting hybrid traits.

Recoveries:
08-08-2022 IJmuiden (Haven), Noord-Holland, NL 5.228,00 N 435,00 E colourring read José Verbeek
10-09-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
27-09-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Guus van Duin
25-10-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
24-11-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-12-2022 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Jan Marbus
10-03-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
26-03-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
05-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
15-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
18-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
19-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
20-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
26-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
31-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
08-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse, Theo Muusse
11-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Joep de Leeuw
12-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read M. Loeve & M. Muusse
21-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
23-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
26-04-2024 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 T. Horst & M. Muusse
14-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
17-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
31-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Merijn Loeve
04-06-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
09-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
15-07-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
10-03-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
20-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
25-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
01-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
04-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse

Data in 2022:

27-Apr-22 3 eggs A egg 73,5 50,5 tip bottom - 70 gr Flag 139 attached.
B egg 72,5 52,3 tip bottom - 40 gr
C egg 70 51 tip bottom - 40 gr
29-Apr-22 2 adults.  female has thin P5 band and standing bird is HG type.
male has cachinnans wing, but bulbuous bill
01-May-22 together with LBBGs
04-May-22 partner 1 present. Images
metal darvic mass wing H+B
22-May-22 pullus .5625162 r-6K 158 33 62,8
pullus .5625163 r-6L 160 35 63,4
pullus .5625164 r-6M 98 30 55,8
21-Jun-22 pullus r-6.L on blocks at nest 135.
partner 2 is defending chick

below: Caspian Gull cachinnans (hybrid) 6.L 4CY, April 04 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 4CY, March 25 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Couple male 4CY hybrid Caspian Gull r-6L and female adult Caspian Gull g-A|A.

below: Caspian Gull cachinnans (hybrid) 6.L 4CY, March 21 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans (hybrid) 6.L 4CY, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

Prospecting colony Lelystad in 2024, and bonding to female g-A|A in 2025.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, July 09 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, June 04 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, May 14 2024, colony Lelystad, the Netherlands. Picture: Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, April 30 2024, colony Lelystad, the Netherlands. Picture: Mars Muusse.

With female Herring Gull.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, April 12 2024, colony Lelystad, the Netherlands. Picture: Merijn Loeve & Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, April 08 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, March 26 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, March 20 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, March 19 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans (hybrid) 6.L 3CY, February 15 2024, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans (hybrid) 6.L 1CY, September 27 2022, Almere, the Netherlands. Picture: Guus van Duin.

below: Caspian Gull cachinnans (hybrid) 6.L 1CY, September 10 2022, Almere (De Vaart), the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans (hybrid) 6.L 1CY, July 17 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans (hybrid) 6.L 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

r[6.M] cachinnans from nest 139. Picture: June 28th, 2022.
Fledged. Sibling r[6.L] also fledged. Sibling r[6.K] ringed on May 22nd. No observations since.

below: Caspian Gull cachinnans (hybrid) 6.L 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.