Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans U|5 adult, 2026, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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Tibia ring G-U|5 and metal NLA 6.260.165, ringed as breeding adult male Larus cachinnans on April 13 2026 in nest 248 at Lelystad, the Netherlands. Ringed by Thijs Horst (Roland-Jan Buijs ringing team).
Data for nest 248-2023:
| 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 | 248-2023 | 71,2 | 52,5 | 98,81 | 71,2 | 51,7 | 95,82 | 72,5 | 51,3 | 96,07 | 290,70 | No. |
| ring pulli: May 10 | laying A egg: April 05 | hatch A egg: May 03 | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | bill: | gonys: | greytone: | |||
| Pullus | 11-5-2023 | NLA 5625196 | r 7.Z | largest chick | ||||||||
| Pullus | 11-5-2023 | NLA 5625197 | r 7.0 | smallest chick | ||||||||
| Pullus | 11-5-2023 | NLA 5625198 | r 7.1 | middle chick | ||||||||
| Pullus | 18-6-2023 | r-7Z | ||||||||||
| Pullus | 18-6-2023 | r-71 | ||||||||||
| Pullus | 18-6-2023 | r-70 | ||||||||||
| 248-2023 | ||||
| dam: | dam 2 west | |||
| location: | 22 mtr W of blue sign VHF20 and 22 mtr east of lighthouse. Between bushes, top of dam, visible from N side. Coded 248 | |||
| breeders: | cach x cach | |||
| OBSERVATIONS: | ||||
| 04-04-2023 | adult | 1 cach at nest location. | ||
| 09-04-2023 | 3 eggs. | 3 eggs measured. No watertest, chick ringing in 1st session. | ||
| 26-04-2023 | 3 eggs. | |||
| 11-05-2023 | 3 pulli | ringed | ||
| 27-05-2023 | nest | empty, no chicks found. | ||
| 18-06-2023 | pulli | r-70, r-71 & r-7Z have fledged. | ||
| 25-06-2023 | pulli | r-70, r-71 & r-7Z present, all 3 chicks fledged. | ||
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: | |
| cach | 73,3 | 52,2 | 100,56 | 72,8 | 52 | 99,11 | 71 | 50,2 | 90,09 | 289,77 | |||
| 248-2024 | # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | ||||||
| 3 | 4-4-2024 | 2-5-2024 | |||||||||||
| dam: | dam 2 west | ||||||||||||
| location: | between lighthouse and blue sign, visible from north side. Sign: yellow helmet. Nest in line with 3 poles of nets. | ||||||||||||
| parents? | Same as 2023? | ||||||||||||
| ring pulli: | 6-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 07-05-2024 | g-B|C | .5631250 | 248 helmet | PONT | 1CY | 89 | |||||||
| 07-05-2024 | g-B|D | .5631151 | 248 helmet | PONT | 1CY | 147 | |||||||
| 14-05-2024 | g-B|C | .5631250 | 248 | PONT | 1CY | 297 | CONTROLL | ||||||
| 14-05-2024 | g-B|D | .5631151 | 248 | PONT | 1CY | 394 | CONTROLL | ||||||
| 04-06-2024 | g-B|C | .5631250 | 248 | PONT | 1CY | 255 | 1049 | 115,4 | CONTROLL | ||||
| OBSERVATIONS: | |||||||||||||
| 21-04-2024 | eggs: | 3 eggs, measured. | |||||||||||
| 02-05-2024 | eggs: | 2 eggs, 1x hatched halfway. | |||||||||||
| 02-05-2024 | chicks: | 1 wet chick, hatched this morning. | |||||||||||
| 07-05-2024 | chicks: | 2x ringed; 3rd chick not found. No eggs in nest. | |||||||||||
| food: | several fish species, including Roach. | ||||||||||||
| 14-05-2024 | chicks: | 2x ringed chicks CONTROLL | |||||||||||
| food: | 3x Roach type. |
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| 04-06-2024 | pullus: | g-B|C present, measured. | |||||||||||
| food: | 2x Silver Bream (Blicca bjoerkna), Dutch: Kolblei. | ||||||||||||
| 18-06-2024 | chicks: | g-B|C & g-B|D & unringed sibling present. Nest with 3 chicks. | |||||||||||
Visits and data 248-2025.
| 2025 | parent 1 | parent 2 | A_length | A_width | A_volume | B_length | B_width | B_volume | C_length | C_width | C_volume | TOTAL NEST:
|
# eggs | A-egg | hatch | |
| 248 | cach | cach | 70,2 | 52,1 | 68 | 51,8 | 2 | 3/28/2025 | 4/26/2025 | |||||||
| dam: | dam 2 west
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| location: | 248 Yellow hemlet nest, same as 248-2024, between lighthouse and blue sign, Visible from N-side, Yellow helmet next to nest,
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| ouders: | same as 2024?
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| ring pulli: | 1-May | |||||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale | |||
| 28-04-/2025 | g-M|6 | 5641007 | 248/gele helm | PONT | PULLUS | 96 | ||||||||||
| 13-05-2025 | g-M|6 | 5641007 | 248/gele helm | PONT | PULLUS | 672 | ||||||||||
| 31-05-2025 | g-M|6 | 5641007 | 248/gele helm | PONT | PULLUS | 301 | 930 | 111,7 | 41,7 | 13,5 | ||||||
OBSERVATIONS:
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| 21-04-2025 | eggs | 2x eggs measured, Will not have a 3rd egg.
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| 28-04-2025 | pullus | 1x pullus ring, other 1 not found.
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| 08-05-2025 | adult | both partners present.
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| 13-05-2025 | chick | g-M|6 present, 672gr.
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| food | fish. | |||||||||||||||
| 31-05-2025 | chick | g-M|6 caught on water, measured.
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below: Caspian Gull cachinnans U|5 adult, April 13 2026, colony Lelystad, the Netherlands. Picture: Thijs Horst & Mars Muusse.
| date: | darvic | metal | location / nest# | species | sexe | age | wing | tarsus | head+ bill | bill | gonys | mass | greyscale | barcode | comments |
| 13-4-2026 | G-U|5 | .6260165 | Nest 248 gele helm | PONT | M | >4CY | 471 | 75,8 | 139,1 | 63,8 | 20,5 | 1111 | 26B02641 | Trapped by ringer. Breeder on 3 eggs. |
