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 P:U60 4CY-7CY, March 2021 - July 2024, Lelystad & Almere, the Netherlands. Picture: Thijs Horst, Mars Muusse & Albert de Jong.
Metal ring PLG DN35458 and yellow P:U60, ringed as pullus on June 09 2018 in a mixed Caspian Gull colony "Larus cachinnans kolonia" with cachinnans dominance, at river Wisla, POLAND, by ringer Lukasz Bednarz.
In all respects, y[P:U60] is cachinnans, no indication for hybrid.
From 2021 onwards, breeding in colony Lelystad, nest always at the same spot (2021-2024).
| 09/06/2018 | Rz.Wisła,Zastów Karczmiski,Opole Lubelskie POLAND (LUBELSKIE) | Łukasz Bednarz |
| 03/08/2018 | Składowisko odpadów PUO Świdnica, Sulisławice POLAND (DOLNOŚLĄSKIE) | Benedykt Adamczyk |
| 09/09/2018 | Dreba-Plother-Teichgebiet: Kohlungsteich GERMANY (THÜRINGEN) | HIDDENSEE .DEH Schoder, Frank |
| 17/04/2020 | Salzgitter-Heerte:Deponie GERMANY (NIEDERSACHSEN: BRAUNSCHWEIG) | Gerhard Braemer |
| 16/05/2020 | Orava lake, Bird island SLOVAKIA (NAMESTOVO) | Miro Demko |
| 19/03/2021 | Almere: de Vaart NETHERLANDS (FLEVOLAND) | Eric Roeland |
| 23/03/2021 | Almere: de Vaart NETHERLANDS (FLEVOLAND) | Eric Roeland |
| 24/03/2021 | Lelystad NETHERLANDS (FLEVOLAND) | Mars Muusse Albert de Jong |
| 04/05/2021 | Almere de Vaart NETHERLANDS (FLEVOLAND) | thijs horst |
| 04/08/2021 | Trintelzand NETHERLANDS (FLEVOLAND) | D. B. |
| 09/10/2021 | Almere: de Vaart NETHERLANDS (FLEVOLAND) | Eric Roeland |
| 21/06/2022 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst |
| 19/09/2022 | dike Enkhuizen-Lelystad NETHERLANDS (FLEVOLAND) | Guus van Duin |
| 05/02/2023 | Almere: de Vaart NETHERLANDS (FLEVOLAND) | Eric Roeland |
| 13/02/2023 | Almere de Vaart NETHERLANDS (FLEVOLAND) | thijs horst |
| 24/02/2023 | Almere: de Vaart NETHERLANDS (FLEVOLAND) | Eric Roeland |
| 26/03/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 04/04/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 06/04/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse Albert de Jong |
| 09/04/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 13/05/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 27/05/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse Merijn Loeve |
| 18/06/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 25/06/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst |
| 08/07/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 18/07/2023 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 15/12/2023 | Almere: de Vaart NETHERLANDS (FLEVOLAND) | Eric Roeland |
| 16/01/2024 | Almere de Vaart NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 18/01/2024 | Almere de Vaart NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 19/03/2024 | Lelystad, Bataviahaven NETHERLANDS (FLEVOLAND) | Maarten Hotting |
| 19/03/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 20/03/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 25/03/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst |
| 26/03/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 30/03/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Harry Kuipers |
| 30/03/2024 | Lelystad, Bataviahaven NETHERLANDS (FLEVOLAND) | Harry Kuipers |
| 31/03/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 08/04/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse Gabi Martin, Theo Muusse |
| 11/04/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | J. de L. |
| 21/04/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 23/04/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 26/04/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse Albert de Jong |
| 02/05/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse, Albert de Jong |
| 05/05/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse, Fred Cottaar |
| 07/05/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 17/05/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst |
| 31/05/2024 | Lelystad Colony Oostvaardersdiep NETHERLANDS (FLEVOLAND) | Merijn Loeve Thijs Horst |
| 04/06/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse Albert de Jong |
| 18/06/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 24/06/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst |
| 25/06/2024 | Bataviahaven, Lelystad NETHERLANDS (FLEVOLAND) | thijs horst Mars Muusse |
| 30/07/2024 | De Kreupel NETHERLANDS (FLEVOLAND) | thijs horst Jeroen van Assema |
In 2021 breeding bird at colony Lelystad, the Netherlands. Y-P:U60 is a female, partner is large unringed adult male Caspian Gull cachinnans in nest 68.
This nest is in a section with large bolders and blocks, nest not visible from the water and many Lesser Black-backed Gulls breeding around and nests at close range.
Chicks can hide in numerous crevices underneath the blocks, making them hard to find. Visits and data for this nest:
| date: | egg no: | width (mm) | length (mm) | volume (cm3): | water test on May 7th: | |
| 06-05-2021 | A | 50,1 | 73,3 | 91,34 | 90 - tip at bottom. | 2 eggs in the nest, one partner is y[P:u60] 4CY cachinnans. |
| B | 49,2 | 70,9 | 92,28 | 90 - floating halfway. | ||
| sum nest: | -- | |||||
| 13-05-2021 | No visit, Camilla is trapping a spoonbill. | |||||
| 15-05-2021 | 2 eggs, still complete. y[P:U60] and partner is large Caspian Gull male. | |||||
| 28-05-2021 | nest is empty. y[P:U60] and partner both alarming. Chicks not found between all those blocks. | |||||
| 08-06-2021 | No activity visible from south side. Later, from north side y[P:U60] flying around. | |||||
Data for nest y-PU60: |
||||||
| 12-04-2022 | y-P:U60 present. Nest not excatly located yet, but close to place of previous season. | |||||
| egg no: | width (mm) | length (mm) | volume (cm3): | water test on April 12th: | ||
| 15-04-2022 | A | 51,8 | 72,9 | -- | 40 - tip at bottom. | 3 eggs in the nest. |
| B | 51,3 | 71,6 | -- | 30 - tip at bottom. | Extrapolation: 1st egg laid on April 9th; 1st egg will hatch on May 7th. Ring: May 14th. | |
| C | 50,1 | 70,5 | -- | 20 - tip at bottom. | ||
| sum nest: | -- | |||||
| 27-04-2022 | A | 4 mm- floating. | 3 eggs in the nest. | |||
| B | 3 mm- floating. | |||||
| C | 2 mm- floating. | |||||
| 09-05-2022 | y-P:U60 present. | |||||
| metal | darvic | mass | ||||
| 17-05-2022 | .5625114 | r-5T | 293 | Much fish around nest, incl Roach / Rudd and Perch. | ||
| .5625115 | r-5S | 191 | ||||
| .5625116 | r-5R | 329 | ||||
| metal | darvic | mass | ||||
| 30-05-2022 | .5625116 | r-5R | 680 | y-P:U60 and partner are present, together with (at least) . | ||
| 02-06-2022 | 2 adults and 3 large chicks present. | |||||
| 17-06-2022 | 2 adults and (at least) 2 chicks present. | |||||
| 21-06-2022 | 2 adults and all 3 large chicks r-5R, r-5S & r-5T present. | |||||
| 28-06-2022 | 2 adults and all 3 large chicks r-5R, r-5S & r-5T present. | |||||
| 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 | PU60 | 76,6 | 51 | 100,32 | 69,2 | 50,3 | 88,15 | 72,1 | 51,3 | 95,54 | 284,01 | same as 2022 |
| ring pulli: 10-mei | laying A egg: 5-apr | hatch A egg: 3-mei | ||||||||||
| date: | metal: | darvic: | mass: | wing: | head+bill: | |||||||
| pullus | 11-05-2023 | NLA5556478 | r 8.3 | -- | -- | -- | ||||||
| pullus | 11-05-2023 | NLA5556479 | r 8.5 | -- | -- | -- | ||||||
| pullus | 18-05-2023 | 5556495 | G-7|C | 550 | -- | 89,8 | ||||||
| pullus | 27-05-2023 | 5556495 | G-7|C | 955 | -- | -- | ||||||
| dam: | dam 1 blocks | |
| location: | location is PU60-2022. Red spot on block near nest. | |
| breeders: | cach x cach | |
| OBSERVATIONS: | ||
| 09-04-2023 | adult: | female PU60 & adult male cach present. Red spot renewed. |
| nest: | 3 eggs measured. Watertest C-egg: 20 - tip bottom. | |
| 11-05-2023 | pulli: | 2 chicks ringed, is there a 3rd chick? |
| 13-05-2023 | adult: | PU60 & male cach present. |
| 18-05-2023 | pulli: | 1 chick ringed G-7|C, R-85 present. |
| 27-05-2023 | pulli: | 1x control chick G-7|C. |
| 18-06-2023 | pulli: | r-83, r-85, g7|C present, with 2 adults (incl PU60). Fledged: 3 juveniles. |
| 25-06-2023 | pulli: | family complete, 3x chicks 2x parents. Result 2023: 3x fledged juveniles. |
below: Caspian Gull cachinnans P:U60 7CY, July 30 2024, colony De Kreupel, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans P:U60 7CY, June 25 2024, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
Together with the only fledged chick for 2024: g-B|8.
below: Caspian Gull cachinnans P:U60 6CY, July 18 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans P:U60 6CY, July 08 2023, Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
below: Caspian Gull cachinnans P:U60 6CY, April 05 2023, Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans P:U60 6CY, February 13 2023, Almere, the Netherlands. Picture: Thijs Horst & Mars Muusse.
With male partner at Almere dump.
below: Caspian Gull cachinnans P:U60 5CY, June 21 2022, Lelystad, the Netherlands. Picture: Thijs Horst.
below: Caspian Gull cachinnans P:U60 5CY, May 30 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
below: Caspian Gull cachinnans P:U60 5CY, April 27 2022, Lelystad, the Netherlands. Picture: Mars Muusse.
below: Caspian Gull cachinnans P:U60 4CY, June 08 2021, Lelystad, the Netherlands. Picture: Mars Muusse & Albert de Jong.
below: Caspian Gull cachinnans P:U60 4CY, May 15 2021, Lelystad, the Netherlands. Picture: Mars Muusse & Mónika Ballmann.
below: Caspian Gull cachinnans P:U60 4CY, March 30 2021, Almere, the Netherlands. Picture: Mars Muusse.
Y-P:U60 and her partner present at a small local waste dump at Almere, distance about 17 km's from the colony.
below: Caspian Gull cachinnans P:U60 4CY, March 24 2021, Lelystad, the Netherlands. Picture: Mars Muusse & Albert de Jong.
Also present today: w-327:U from Czechia.
