Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans (hybrid?) F|N 2CY-6CY, July 2020 - March 2024, the Netherlands. Picture: Eric Roeland, Thijs Horst, Mars Muusse & Daniel Beuker.
Tibia ring N-F|N and metal ring Arnhem 5.548.161, ringed as pullus Larus cachinnans on May 16 2019 at Lelystad (Bataviahaven), Holland (5230.00 N 525.00 E) - ringer Roland-Jan Buijs.
Unmistakable some cachinnans-blood and traits, but especially the images of 3CY-March show Herring-like head shape and spring streaking.
Then again, as breeding 4CY it appears to have much black in the wingtip, more so than average Caspian gulls.
Remarks : related N-F|P (sibling 2019, never recorded, hence probably dead).
Remarks: r-7.N female partner, ringed in 2023.
Remarks: r-7.B chick in 2022; r-8.F & r-8.J chicks in 2023.
Recoveries:
19-06-2019 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Debby Doodeman
01-08-2019 Lelystad (Oostvaardersdijk), Flevoland, NL 5.228,00 N 519,00 E colourring read Merijn Loeve
28-12-2019 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Benjamin Griard
30-12-2019 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Patrick Derrien
02-01-2020 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Patrick Derrien
04-01-2020 Sonzay (Vuilstort), Indre-et-Loire, FRANKRIJK 4.730,00 N 28,00 E colourring read Benjamin Griard
08-05-2020 Groene Kan (Hoogekampse Plas), Utrecht, NL 5.206,00 N 509,00 E colourring read Hein Prinsen
29-07-2020 Almere (De Blocq van Kuffeler), Flevoland, NL 5.225,00 N 513,00 E colourring read Eric Roeland
08-12-2020 Oss (Vuiloverslag), Noord-Brabant, NL 5.147,00 N 532,00 E colourring read Stefan van Schaik
04-02-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
18-02-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
18-03-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
19-03-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
23-03-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
30-03-2021 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Mars Muusse
17-06-2021 Markermeer (Trintelzand), Flevoland, NL 5.238,00 N 522,00 E colourring read Daniël Beuker
12-04-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Mars Muusse
01-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Mars Muusse
04-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Mars Muusse & Thijs Horst
09-05-2022 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E captured by ringer Roland-Jan Buijs & Mars Muusse
20-09-2022 Katwijk aan Zee (Buitenwatering), Zuid-Holland, NL 5.212,00 N 423,00 E colourring read Annelies Marijnis
01-12-2022 Almere (Dashorstdijk), Flevoland, NL 5.225,00 N 512,00 E colourring read Thijs Horst
04-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
08-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Dick Kuipers
11-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
24-02-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
07-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
10-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
17-03-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
04-04-2023 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
04-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
27-04-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
13-05-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
26-06-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
08-07-2023 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Thijs Horst
02-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
05-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
06-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Eric Roeland
12-01-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read T. Horst & M. Muusse
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
01-02-2024 Almere (De Vaart), Flevoland, NL 5.224,00 N 514,00 E colourring read Thijs Horst
19-03-2024 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
30-03-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read Harry Kuipers
30-03-2024 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
21-04-2024 Lelystad (Bataviahaven), Flevoland, NL 5.230,00 N 525,00 E colourring read T. Horst & M. Muusse
This appeared to be first ever "known local recrutement" breeding Caspian Gull in colony Lelystad. As 4CY bird, n-F|N had as nest and raised one chick, r-7.B. Visits and data:
| date | |||||||
| 12-04-2022 | Cachinnans-type n-F|N guarding high on dam 2. | ||||||
| 01-05-2022 | Cachinnans-type n-F|N walks from nest in small bush, high on dam 2. Below him is nest 061Z. | ||||||
| Cachinnans female landed next to n-F|N, and this female is ringed on tarsus! (in retrospect: never seen again this bird). | |||||||
| 04-05-2022 | Two adults at nest. Female cachinnans and 4CY n-F|N. | ||||||
| 3 eggs | egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 4th: | ||
| A egg | 49,9 | 74 | -- | -- | |||
| B egg | 47,9 | 68,5 | -- | -- | |||
| C egg | 50 | 71 | -- | -- | |||
| 09-05-2022 | 3 eggs. We trapped n-F|N at the nest. Took pictures, but no measurements taken. | ||||||
| 17-05-2022 | 3 eggs. | ||||||
| 22-05-2022 | 3 eggs. | ||||||
| 30-05-2022 | n-F|N at nest. 2 chicks. | ||||||
| pullus | metal | darvic | mass | wing | H+B Bill | ||
| .5625183 | r-7.B | 87 | 25 | 53,9 18,4 | |||
| pullus | 1 pullus dead in nest. | ||||||
| 02-06-2022 | Cachinnans-type n-F|N defending nest. | ||||||
| 17-06-2022 | Cachinnans-type n-F|N at nest. | ||||||
| 21-06-2022 | Nest empty, Chick r-7.B not found in vegetation. | ||||||
| 12-07-2022 | Photographed r-7.B. Fledged. | ||||||
| In 2022 one chick ringed in this nest: r-7.B. | |||||||
| 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 | nFN & r7N | 0 | 0 | 0,00 | 0 | 0 | 0,00 | 0 | 0 | 0,00 | 0,00 | same as 2022 |
| ring pulli: -- | laying A egg: -- | hatch A egg: -- | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | bill: | gonys: | greytone: | |||
| adult | 03-05-2023 | 6.214.906 | R-7.N | -- | 433 | 123,7 | 52,6 | 18,4 | 6 | female cach | ||
| pullus: | 18-05-2023 | 5.556.488 | R-8.F | 256 | -- | 65,4 | -- | -- | -- | |||
| pullus: | 18-05-2023 | 5.556.489 | R-8.J | 224 | -- | 70 | -- | -- | -- | |||
| pullus: | 27-05-2023 | 5.556.488 | R-8.F | 643 | -- | -- | -- | -- | -- | |||
| pullus: | 18-06-2023 | 5.556.489 | r-8.J | 1020 | 341 | 126,8 | -- | -- | -- | with sibling | ||
| n-F|N & r-7.N | |||
| dam: | dam 1 west | ||
| location: | Is nest n-F|N-2022. Nest 2023 is 3 mtr further N now, closer to Herring Gull w-8Z. | ||
| breeders: | cach x cach | ||
| OBSERVATIONS: | |||
| 04-04-2023 | adult: | n-F|N at nest location. | |
| 09-04-2023 | nest: | no eggs, but nest ready. | |
| adult: | Male is n-F|N, female is cach unringed. | ||
| 27-04-2023 | adult: | Male is n-F|N, female is cach unringed. | |
| 03-05-2023 | adult: | Trapped unringed female at nest: r-7N. | |
| 13-05-2023 | adult: | Both parents present. | |
| 18-05-2023 | pulli: | 2 chicks ringed, 3rd one not found. | |
| 27-05-2023 | pulli: | 1x control chick. | |
| 18-06-2023 | pulli: | r-8J & r-8F present. Probably no 3rd chick. Fledged: 2 juveniles. | |
| 25-06-2023 | pulli: | r-8J & r-8F present. Both parents as well. | |
Originally, n-F|N is a chick from Lelystad, hatch year HY=2019. Bird ringed in nest F2019, together with sibling n-F|P (which has not been recorded since, hence probably dead).
Limited data:
| May 01 2019 | 3 eggs in nest. |
| May 16 2019 | 2 chicks ringed: n[F|N] & NLA 5.548.161 and n[F|P] & NLA 5.548.162 |
| May 24 2019 | no data. |
below: Hybrid (?) Caspian Gull cachinnans F|N 6CY, March 26 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Hybrid (?) Caspian Gull cachinnans F|N 6CY, March 19 2024, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Hybrid (?) Caspian Gull cachinnans F|N 6CY, February 01 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst.
below: Hybrid (?) Caspian Gull cachinnans F|N 6CY, January 16 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Hybrid (?) Caspian Gull cachinnans F|N 6CY, January 12 2024, Almere - De Vaart, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, July 08 2023, Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, June 25 2023, Lelystad, the Netherlands. Picture: Thijs Horst.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, April 27 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: female cachinnans, partner of n[F|N], April 27 2023.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, April 04 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Back at the same territory as it was in 2022.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, March 17 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, February 24 2023, Almere, the Netherlands. Picture: Eric Roeland.
below: Hybrid (?) Caspian Gull cachinnans F|N 5CY, February 04 2023, Almere, the Netherlands. Picture: Eric Roeland.
below: Hybrid (?) Caspian Gull cachinnans F|N 4CY, May 09 2022, Lelystad colony, the Netherlands. Picture: Mars Muusse.
Trapped as breeding bird at the nest.
below: Hybrid (?) Caspian Gull cachinnans F|N 4CY, April 12 2022, Lelystad colony, the Netherlands. Picture: Mars Muusse.
First local ringed bird that is returning in the colony for a serious breeding attempt? Partner is adult Caspian Gull, inspecting nest 61 together.
below: Hybrid (?) Caspian Gull cachinnans F|N 3CY, June 21 2021, Trintelzand, the Netherlands. Picture: Daniel Beuker.
PMS: P7-P10 old.
below: Hybrid (?) Caspian Gull cachinnans F|N 3CY, March 19 2021, Almere, the Netherlands. Picture: Eric Roeland.
Head shape and streaking suggest at least some Herring Gull blood in this individual.
below: Hybrid (?) Caspian Gull cachinnans F|N 2CY, July 29 2020, Lelystad, the Netherlands. Picture: Eric Roeland.
PMS: P7/-.
