Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
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Caspian Gull cachinnans hybrid 0:X adult, 2026, colony Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.
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Tibia Y-0:X and metal 5.646.671, ringed as adult female hybrid Larus cachinnans on May 05 2026 in colony Lelystad, the Netherlands. Ringer: Roland-Jan Buijs ringing team.
Recoveries:
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Visits and data nest r-5X & y-0:X (2026)
| 2026 |
parent 1 |
parent 2 |
A_length |
A_width |
A_volume |
B_length |
B_width |
B_volume |
C_length |
C_width |
C_volume |
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# eggs |
| r-5X & y-0:X |
cach |
hybrid |
74,1 |
47,3 |
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71,0 |
46,9 |
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68,0 |
47,0 |
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| date |
darvic |
metal |
location / nest# |
species |
sexe |
age |
wing |
tarsus |
head+ bill |
bill |
gonys |
mass |
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| 05-05-2026 |
Y-0:X |
5.646.671 |
nest r-5X |
HYBRID |
F |
>4CY |
417 |
67,7 |
119,7 |
54 |
18,8 |
822 |
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| 22-04-2026 |
nest |
1 egg, measured. |
| 26-04-2026 |
nest |
3 eggs, measured. |
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parents |
1x unringed hybrid Caspian Gull. |
| 05-05-2026 |
parents |
trapped unringed hybrid Caspian Gull, now y-0:X. |
| 10-05-2026 |
nest |
3 eggs. |
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below: Caspian Gull cachinnans hybrid 0:X adult, May 05 2026, colony Lelystad, the Netherlands. Picture: Mars Muusse & Thijs Horst.






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