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.X 1CY-4CY, May 2022 - April 2025, Almere & Lelystad, the Netherlands. Picture: Eric Roeland, Thijs Horst & Mars Muusse.

Red tibia ring r[6.X] and metal NLA 5.625.175, ringed as pullus F1 hybrid L. argentatus x L. cachinnans at nest 48 on May 30 2022 in colony Lelystad, the Netherlands. Ringer: Albert de Jong / Roland-Jan Buijs ringing team.
ID certain in 2022: father is adult cachinnans, mother is adult argentatus.

Recoveries:
17-07-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
03-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
19-10-2023 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Thijs Horst
12-11-2023 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
30-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
12-01-2024 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
15-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
16-03-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
30-03-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
13-09-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
30-10-2024 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
03-01-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 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 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
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

Visits and data 2022 for nest 48

Estimation egg laying: A-egg = April 21 2022. Estimating hatching = May 19 2022.

12-Apr-22 adult on block in front of nest 48-2021.
     
15-Apr-22 nest empty, but ready for use.
   
19-Apr-22 same guarding adult as picture 12 April, same block.
     
4-May-22 adult cachinnans-type landed.
         
9-May-22     length width
  3 eggs A egg 71,1 48,5
B egg 70,3 48,6
C egg 68,6 46,9
     
17-May-22 3 eggs B & A hatching
C egg still intact
           
metal darvic mass wing H+B Bill
30-May-22 pullus 5625174 r-6.W 235 51 69 26
pullus 5625175 r-6.X 338 65 77 30,5
             
12-July-22 r-6X photo.
             
17-July-22 r-6X photo.

below: Caspian Gull cachinnans hybrid 6.X 4CY, April 12 2025, colony Lelystad, the Netherlands. Picture: Mars Muusse.

below: Caspian Gull cachinnans hybrid 6.X 4CY, April 01 2025, colony Lelystad, the Netherlands. Picture: Mars Muusse.

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

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

below: Caspian Gull cachinnans hybrid 6.X 4CY, January 03 2025, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid 6.X 3CY, October 30 2024, Almere - Oostvaardersdijk, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid 6.X 3CY, March 30 2024, Almere, the Netherlands. Picture: Eric Roeland.

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

below: Caspian Gull cachinnans hybrid 6.X 3CY, January 12 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 6.X 2CY, November 12 2023, Almere, the Netherlands. Picture: Eric Roeland.

below: Caspian Gull cachinnans hybrid 6.X 2CY, October 19 2023, Almere, the Netherlands. Picture: Thijs Horst.

below: Caspian Gull cachinnans hybrid 6.X 2CY, February 03 2023, Almere, the Netherlands. Picture: Eric Roeland.

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

below: Caspian Gull cachinnans hybrid 6.X 1CY, July 12 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Caspian Gull cachinnans hybrid 6.X 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.

r[6.X] cachinnans hybrid from nest 48 (15B). Picture: May 30th, 2022.
Ringed on May 30th. No observations since. Same for sibling r[6.W]. No confirmation on 3rd egg.