Larus cachinnans in the Netherlands
(last update: August 16, 2020)
Caspian Gull cachinnans U|4 adult, 2026, the Netherlands. Picture: Thijs Horst & Mars Muusse.
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Tibia ring G-U|4 and metal NLA 6.260.164, ringed as breeding adult male Larus cachinnans on April 13 2026 in nest 204 at Lelystad, the Netherlands. Ringed by Thijs Horst (Roland-Jan Buijs ringing team).
Visits and data 2022.
| nest 204 | date A egg: April 4 2022 | hatch A egg: May 2 2022 | ring pulli: May 9 2022 | |||||
| 15-04-22 | 3 eggs | A egg | 70,2 | 51,8 | tip bottom - 50 gr | nest 204 is 3 mtr E of 203. | ||
| B egg | 70,8 | 51,5 | tip bottom - 50 gr | code 204 sprayed on block. | ||||
| C egg | 68,7 | 51,8 | tip bottom - 40 gr | |||||
| 29-04-22 | 3 eggs | A egg | float - 3 mm | |||||
| B egg | float - 3 mm | |||||||
| C egg | float - 2 mm | |||||||
| 01-05-22 | adult cachinnans at nest. NOTE: 2x yellow-legged cachinnans of nest 203 close by. | |||||||
| 04-05-22 | adult cachinnans at nest. NOTE: male cachinnans of nest 203 has red spot stone as guarding stone. | |||||||
| 17-05-22 | no chicks found in vegetation. | |||||||
| metal | darvic | mass | wing | H+B | ||||
| 22-05-22 | pullus | .5625160 | r-6H | 537 | 125 | 90,6 | ||
| pullus | .5625161 | r-6J | 582 | 108 | 91,7 | |||
| 30-05-22 | pullus | r-6H swimming with sibling at N-side of dam 2. | ||||||
| pullus | r-6J swimming | |||||||
| 21-06-22 | pullus | r-6J & r6H swimming with sibling at N-side of dam 2. | ||||||
| 28-06-22 | r-6J & r-6H picture | |||||||
| 17-07-22 | pullus | r-6H picture. | ||||||
| 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 | 204-2023 | 72,5 | 52,3 | 99,85 | 70,6 | 52,3 | 97,23 | 67,3 | 51,5 | 89,87 | 286,95 | same as 2022 |
| ring pulli: May 10 | laying A egg: April 05 | hatch A egg: May 03 | ||||||||||
| catch: | date: | metal: | darvic: | mass: | wing: | head+bill: | ||||||
| Pullus | 11-5-2023 | 5.625.199 | r-72 | - | small chick, food is roach | |||||||
| Pullus | 11-5-2023 | 5.625.200 | r-73 | - | small chick | |||||||
| Pullus | 27-5-2023 | 5.625.199 | r-72 | 751 | ||||||||
| Pullus | 27-5-2023 | 5.625.200 | r-73 | 455 | ||||||||
| Pullus | 27-5-2023 | 5.625.261 | g-8|M | 480 | ||||||||
| 204-2023 | |||
| dam: | dam 2 west | ||
| location: | Is nest 204-2022. East nest of 203-204. 13 mtr E of lighthouse. | ||
| breeders: | cach x cach | ||
| OBSERVATIONS: | |||
| 9-4-2023 | nest: | 3 eggs measured. No watertest, ring chicks in 1st session. | |
| 26-4-2023 | nest: | 3 eggs. | |
| 11-5-2023 | pulli | 2 chicks ringed, 3rd chick? | |
| 27-5-2023 | pulli | 1x extra chick ringed; 3x chicks measured. | |
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: | |
| 204-2024 | cach | cach | 76 | 51,7 | 102,28 | 73,7 | 50,7 | 95,39 | 72,5 | 51,2 | 95,69 | 293,36 | |
| # eggs | A-egg | hatch | # ringed chicks | # all chicks | # fledged chicks | comments | |||||||
| 3 | 15-4-2024 | 13-5-2024 | |||||||||||
| dam: | dam 2 west | ||||||||||||
| location: | between lighthouse and blue sign, 5 mtr west of 248; was 204-2023. Red spot | ||||||||||||
| parents? | Same as 2023? | ||||||||||||
| ring pulli: | 18-May | ||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | greyscale |
| 07-05-2024 | g-B|E | .5631152 | 204 | PONT | 1CY | 153 | |||||||
| 07-05-2024 | g-B|F | .5631153 | 204 | PONT | 1CY | 115 | |||||||
| OBSERVATIONS: | |||||||||||||
| 31-03-2024 | adults: | 2x unringed cachinnans, one is immature. | |||||||||||
| 21-04-2024 | eggs: | 3 eggs, measured. | |||||||||||
| 02-05-2024 | eggs: | 3 eggs. | |||||||||||
| 07-05-2024 | chicks: | 2x ringed; 3rd chick not found. No eggs in nest. | |||||||||||
| 14-05-2024 | chicks: | no chicks near nest. Evening: 1x chick + 2x parents near waterfront, north side. | |||||||||||
| 04-06-2024 | chicks: | 2x chicks between blocks: g-B|E & g-B|F. | |||||||||||
| adult: | 2x present. Both are adult Caspian Gull (partner 1 has broad medial band P10). | ||||||||||||
| 18-06-2024 | chick: | g-B|E & g-B|F present at water. | |||||||||||
Visits and data 204-2025.
| 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:
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# eggs |
| 204 | cach | cach | 76,4 | 51,5 | 73,9 | 51 | 72,1 | 50,1 | 3 | ||||
| dam: | dam 2 west
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| location: | between lighthouse and blue sign, 5 mtr west of 248 (yellow helmet); was 204-2023. Red spot.
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| parents: | |||||||||||||
| ring pulli: | |||||||||||||
| date | darvic | metal | location / nest# | species | sexe | age | wing | mass | head+ bill | bill | tarsus | gonys | |
| 28-04-2025 | g-M|7 | 5.641.008 | 204 | PONT | PULLUS | 74 | |||||||
| 28-04-2025 | g-M|8 | 5.641.009 | 204 | PONT | PULLUS | 84 | |||||||
| 13-05-2025 | g-M|7 | 5.641.008 | 204 | PONT | 457 | ||||||||
OBSERVATIONS:
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| 16-03-2025 | nest | 2x cach at blocks in front of nest 204 / nest 248, northside dam 2 west.
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| 21-04 | eggs | 3 eggs, measured.
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| 23-04 | adult | Caspian Gull at block.
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| 28-04 | nest | 2 pullus ringed, 1 hatching.
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| 08-05-2025 | adult | both partners present.
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| 13-05-2025 | chick | g-M|7 found near water edge, 457gr. G-M|7 fledged & g-M|8 not seen after ringing.
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below: Caspian Gull cachinnans U|4 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 |
| 13-4-2026 | G-U|4 | .6260164 | Nest 204 dam 2 west | PONT | M | >4CY | 474 | 72,7 | 136,6 | 63,7 | 20,6 | 1057 | 26B02640 |
