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 7.P adult, April 2023 - March 2025, Lelystad & Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Red tibia ring r[7.P] and metal NLA 6.214.907, ringed as breeding male Larus cachinnans at nest r-7P / bw-AB (154) on May 03 2023 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs.
ID certain for nest 154, one parent is male Caspian Gull cachinnans, other parent is female Herring Gull argenteus, both in season 2023 & 2024.
In 2024 the partner was trapped, now female Herring Gull b/w-AB.
Recoveries:
13-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
03-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
04-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Jan Zorgdrager
20-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
08-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
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
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
03-05-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
17-05-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
19-06-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
24-06-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-07-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
30-01-2025 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
31-01-2025 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Tim Raats
16-02-2025 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
16-03-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 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
04-04-2025 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
Visits and data 2024
| NEST code | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST: | |
| r-7.P & b/w-AB | cach | teus | 71,4 | 51,7 | 96,09 | 68,6 | 51 | 89,84 | 70,3 | 52,4 | 97,19 | 283,12 | |
| 2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 16-4-2024 | 14-5-2024 | |||||||||||
| dam: | dam 1 south | ||||||||||||
| location: | far western nest in 2023 & 2024. | ||||||||||||
| parents? | same as 2023 | ||||||||||||
| ring pulli: | 18-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | 26-04-2024 | b/w-AB | .5625285 | nest r-7P | teus | F | >4CY | 403 | 119,2 | 51,5 | 64,7 | 18,6 | 5 |
| 18-6-2024 | g-M|S | .5631023 | op water bij r-7P | cach x teus | 1CY | 293 | 986 | 115 | |||||
| 18-6-2024 | g-M|T | .5631024 | op water bij r-7P | cach x teus | 1CY | 287 | 1132 | 120,7 | |||||
| 18-6-2024 | g-M|U | .5631025 | op water bij r-7P | cach x teus | 1CY | 297 | 953 | 113 | |||||
| OBSERVATIONS: | |||||||||||||
| 08-03-2024 | adult: | r-7P & argenteus female. | |||||||||||
| 12-04-2024 | eggs: | empty nest, but is ready. | |||||||||||
| 21-04-2024 | eggs: | 3 eggs, measured. | |||||||||||
| 26-04-2024 | adult: | partner trapped at nest. | |||||||||||
| 14-05-2024 | eggs: |
2 eggs. | |||||||||||
| chicks: | 1x, just hatched. | ||||||||||||
| 31-05-2024 | chicks: | 3x chicks ringed, at dam near nest: g-C|R, g-C|T & g-C|U. In retrospect: thery are from neighbour LBBG nest. | |||||||||||
| 18-06-2024 | adult: | female b/w-AB present. | |||||||||||
| chicks: | 3x chicks ringed, at water near nest. Guarded by unringed male cachinnans. Reason unknown. Rings g-M|S, M|T & M|U. | ||||||||||||
Visits and data for 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 teus | 154-2023 | 74,6 | 51 | 97,70 | 70,6 | 51,9 | 95,75 | 55,2 | 50,5 | 70,88 | 264,33 | NEW NEST |
| ring pulli: | laying A egg: | hatch A egg | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | bill: | gonys: | greytone: | |||
| adult | 03-05-2023 | 6214907 | r-7.P | nn | 449 | 137,2 | 62,2 | 21,3 | 7 | male cachinnans. | ||
| pullus | 18-05-2023 | 5556485 | r-8.+ | 124 | 56 | |||||||
| pullus | 27-05-2023 | 5556485 | r-8.+ | 329 | ||||||||
| 154-2023 | NEW NEST | |
| dam: | dam 1 west | |
| location: | most western nest selected in 2023 at dam 1. | |
| breeders: | cach x teus | |
| OBSERVATIONS: | ||
| 22-04-2023 | nest: | 3 eggs, water test: flat bottom - 3 times (recently laid). |
| 27-04-2023 | adult: | Male cachinnans & female argenteus. Female breeding. |
| 03-05-2023 | adult: | Trapped male cach at nest: r-7.P |
| 13-05-2023 | adult: | Cach r-7P guarding, female teus incubating. |
| 18-05-2023 | pullus: | 1 chick ringed, other 2 not found |
| 27-05-2023 | pullus: | 1x control chick. |
below: Caspian Gull cachinnans 7.P adult, March 21 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans 7.P adult, March 16 2025, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Partner 2024, female Herring Gull b/w-AB also present.
below: Caspian Gull cachinnans 7.P adult, January 30 2025, Almere - de Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans 7.P adult, July 08 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans 7.P adult, June 19 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans 7.P adult, June 18 2024, Almere, the Netherlands. Picture: Mars Muusse.
Feeding at landfill.
below: Caspian Gull cachinnans 7.P adult, March 25 2024, Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans 7.P adult, March 20 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.P adult, March 19 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
With female Herring Gull.
below: Caspian Gull cachinnans 7.P adult, May 13 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.P adult, May 03 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans 7.P adult, April 27 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
