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

Caspian Gull cachinnans hybrid 6.X 1CY-3CY, May 2022 - March 2024, 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 Larus cachinnans hybrid 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: one parent is adult cachinnans, other parent is adult argentatus.

Recoveries:
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
12-01-2024 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

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 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.