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) 5.1 1CY-4CY, May 2022 - March 2025, the Netherlands. Picture: Hans Kouwenberg, Bernadette Balten, Dick Kuipers, Thijs Horst & Mars Muusse.
Red tibia ring r[5.1] and metal NLA 5.625.128, ringed as pullus Larus cachinnans at nest 221 / y[XCHP] on May 17 2022 in colony Lelystad, the Netherlands. Ringer: Albert de Jong / Herman Bouman.
ID certain in 2022, both parents are hybrid Caspian Gull cachinnans: mother is hybrid y[XCHP] from Germany and father is hybrid-type 4CY.
Recoveries:
30-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Albert de Jong
07-08-2022 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Thijs Horst
26-09-2022 Lauwersoog (Haven), Groningen, NL 5.324,00 N 612,00 E colourring read Dick Kuipers
15-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
19-10-2023 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Thijs Horst
02-12-2023 Dorkwerd (Dorkwerdersluis), Groningen, NL 5.315,00 N 630,00 E colourring read Bernadette Balten
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
06-04-2024 Zwolle (Stadshagen), Overijsel, NL 5.232,00 N 604,00 E colourring read Pieter Doornbos
12-09-2024 Gouda (Gouwekanaal), Zuid-Holland, NL 5.201,00 N 440,00 E colourring read Hans Kouwenberg
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
31-07-2025 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
17-08-2025 Zevenhuizen (Rottemeren), Zuid-Holland, NL 5.159,00 N 433,00 E colourring read Maurice van Veen
06-09-2025 Lelystad (Oostvaardersplassen), Flevoland, NL 5.227,00 N 524,00 E colourring read Maarten Hotting
Nest XCHP in 2023
| egg sizes & volume 2023 | ||||||||||||
| SPECIES | NEST | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST: | known parents? |
| cach x cach | XCHP | 70,6 | 52,2 | 96,86 | 67 | 52,7 | 93,69 | 68,3 | 50,8 | 88,75 | 279,30 | same as 2022 |
| ring pulli: 12-mei | laying A egg: 7-apr | hatch A egg: 5-mei | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | ||||||
| Pullus | 11-05-2023 | 5.556.464 | r-8S | -- | -- | -- | ||||||
| Pullus | 11-05-2023 | 5.556.465 | r-89 | -- | -- | -- | ||||||
| Pullus | 18-05-2023 | 5.556.465 | r-89 | 550 | -- | 80,4 | ||||||
| Pullus | 27-05-2023 | 5.556.464 | r-8S | dead > 7 days ago. | ||||||||
| Pullus | 18-06-2023 | r-89 | 1103 | 362 | 130,7 | |||||||
| XCHP | ||||
| dam: | dam 2 east | |||
| location: | below large boulders, east side of blocks, closer to bitumen than 2022. | |||
| breeders: | cach x cach | |||
| OBSERVATIONS: | ||||
| 04-04-2023 | adult: | yXCHP present with partner. | ||
| 05-04-2023 | adult: | yXCHP present with partner. | ||
| 09-04-2023 | adult: | 2 adult cach present. One is yXCHP. | ||
| nest: | 2 eggs measured. No watertest, ring chicks in 1st session. | |||
| 26-04-2023 | nest: | 3 eggs, all measured. Red spot sprayed on stone. | ||
| 27-04-2023 | nest: | 3 eggs. | ||
| adult: | yXCHP present with partner. | |||
| 11-05-2023 | pulli: | 2 chicks ringed, 1 egg rotten | ||
| 13-05-2023 | adult: | yXCHP pictures. | ||
| 18-05-2023 | pulli: | R-89 present | ||
| 27-05-2023 | pulli: | dead chick near nest r-8S, dead >7 days. | ||
| 18-06-2023 | pulli: | r-89 present. Fledging success: 1 chick. | ||
| 25-06-2023 | pulli: | r-89 present with both parents | ||
below: Caspian Gull cachinnans (hybrid) 5.1 4CY, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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below: Caspian Gull cachinnans (hybrid) 5.1 3CY, September 12 2024, Gouda, the Netherlands. Picture: Hans Kouwenberg.
below: Caspian Gull cachinnans (hybrid) 5.1 3CY, June 04 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans (hybrid) 5.1 3CY, March 26 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans (hybrid) 5.1 3CY, March 20 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans (hybrid) 5.1 3CY, March 19 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans (hybrid) 5.1 2CY, December 02 2023, Dorkwerd, the Netherlands. Picture: Bernadette Balten.
below: Caspian Gull cachinnans (hybrid) 5.1 2CY, October 19 2023, Almere, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans (hybrid) 5.1 2CY, February 15 2023, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans (hybrid) 5.1 1CY, September 26 2022, Lauwersoog, the Netherlands. Picture: Dick Kuipers.
Obvious cachinnans traits in this bird.
below: Caspian Gull cachinnans (hybrid) 5.1 1CY, August 07 2022, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans (hybrid) 5.1 1CY, June 28 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
r[5.1] cachinnans hybrid from nest 221 y[XCHP]. Picture: June 28th, 2022.
Fledged. Sibling r[5.0], the 2nd chick, also fledged.
Below: primary pattern nice match to Caspian Gull.
below: Caspian Gull cachinnans (hybrid) 5.1 1CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans (hybrid) 5.1 1CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
