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 2021
nest y-PNED
nest y-PLDP
nest y-PHSV
nest y-P:A02
nest y-P:U60
nest zy-MT
nest r-FB
nest r-FC
nest 001
nest 003
nest 006
nest 011
nest 012
nest 013
nest 014
nest 015
nest 016B
nest 017
nest 018
nest 019
nest 021
nest 034
nest 035
nest 038
nest 040
nest 041
nest 042
nest 044
nest 045
nest 046
nest 047
nest 048
nest 053
nest 055
nest 056
nest 058
nest 060
nest 062
nest 063
nest 065
nest 066
nest 067
nest 072

Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 1CY-4CY, May 2021 - March 2024, the Netherlands & U.K.

Tibia B-F|= and metal NLA Arnhem 5.559.425, ringed as pullus Larus cachinnans on May 28 2021 at Lelystad (Bataviahaven), Holland (5230.00 N 525.00 E) - ringer Roland-Jan Buijs.
Pullus which may belong to Caspian Gull cachinnans nest 53.
Brother/sister is r-F.A.

Recoveries:
19-12-2021 Netherfield (Vuiloverslag), Nottinghamshire, ENGELAND 5.257,00 N 103,00 W colourring read Miles Cluff
30-06-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
16-09-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
19-09-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Stefan van Schaik
02-11-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
04-11-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Jaap van der Linden
04-11-2022 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
02-12-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
04-12-2022 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
27-12-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Guus van Duin
30-12-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
06-01-2023 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
08-01-2023 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
10-02-2023 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
12-02-2023 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Rene Oosterhuis
25-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
29-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read August van Steensel
31-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
04-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
07-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
16-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
10-11-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
06-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Gabi Martin, Mars Muusse & Thijs Horst
15-12-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
27-12-2023 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Jaap van der Linden
02-01-2024 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
06-01-2024 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Tim Raats
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
19-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
20-01-2024 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
25-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
29-03-2024 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 Harry Kuipers & Thijs Horst
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
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
17-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
31-05-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
01-06-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
24-06-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
25-08-2024 Markermeer (Marker Wadden), Flevoland, NL 5.235,00 N 522,00 E colourring read Maarten Hotting

Visits and data for nest 53-2021.

date:            
16-04-2021 Nest checked. 3 eggs.
  egg no: width (mm): length (mm): volume (cm3):  water test on April 24th: laying date:
  A 49,2 70 85,32 30 - tip bottom  
  B 50,6 67,1 86,50 15 - tip bottom  
  C 50,3 70,1 89,30 35 - tip bottom  
sum nest: 261,12
   
24-04-2021 Michahellis present.
   
26-04-2021 Michahellis present, but is this the exact location of nest 53? Flag has fallen down.
   
06-05-2021 2 cachinnans at this location, but flag has fallen down, no exact position determined from water.
   
13-05-2021 No visit, Camilla is trapping a Spoonbill.
   
15-05-2021 3 eggs in nest near flag, with brownish pattern, resembling LBBG-eggs. Was this measured on May 6th? 1,5 meters east another nest, 2 bluish eggs, more like cachinnans.
  Landing adult cachinnans at this nest photographed; LBBG near flag 53 photographed.
   
28-05-2021 Two pulli ringed.
    metal ring darvic ring head + bill age
  pullus .5559425 b-F|= 52,8 age: 2 / 3 days old
  pullus .5559426 r-F.A 50,8 age: 2 / 3 days old
  egg: just hatching.
   
8-6-2021 No visit.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 4CY, March 25 2024, Lelystad, the Netherlands. Picture: Thijs Horst.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 4CY, March 20 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 4CY, March 19 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 4CY, January 18 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 4CY, January 16 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 3CY, December 06 2023, Almere, the Netherlands. Picture: Mars Muusse & Thijs Horst.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 3CY, April 04 2023, Almere, the Netherlands. Picture: Mars Muusse & Thijs Horst.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 3CY, February 12 2023, Almere, the Netherlands. Picture: Rene Oosterhuis.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 2CY, December 02 2022, Almere, the Netherlands. Picture: Eric Roeland.

below: Hybrid Caspian Gull cachinnans x Herring Gull argenteus F|= 2CY, June 30 2022, Almere, the Netherlands. Picture: Thijs Horst.

below: Hybrid Caspian Gull cachinnans F|= 1CY, December 19 2021, Netherfield - Nottinghamshire, U.K. Picture: Miles Cluff.

Pro cachinnans are the nice dark outer webs on inner primaries, the dark centred outer GC, and pale tipped tertials.
However, coarsely marked head and bold anchor patterns on 2nd gen scaps are more in line with argentatus.

below: Hybrid Caspian Gull cachinnans F|= 1CY, May 28 2021, Lelystad, the Netherlands. Picture: Albert de Jong, Roland-Jan Buijs & Mars Muusse.

Rather dark brown chick.