Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Albert de Jong
Merijn Loeve
Roland-Jan Buijs
Thijs Horst
Leon Kelder
Mars Muusse
Caspian Gull cachinnans (hybrid) F|= 1CY-3CY, May 2021 - April 2023, 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, but uncertain (may belong to adjacent LBBG nest).
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
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|= 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.
