Coordinators:
Albert de Jong
Leon Kelder
Roland-Jan Buijs
Thijs Horst
Merijn Loeve
Mars Muusse
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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 g-U|4 & g-U|7 (204-2026).
| 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 |
| g-U|4 (204) |
cach |
cach |
75,8 |
51,5 |
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75,8 |
50,9 |
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72,1 |
49,7 |
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| ringed: |
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| date |
darvic |
metal |
location / nest# |
species |
sexe |
age |
wing |
tarsus |
head+ bill |
bill |
gonys |
mass |
barcode |
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| 13-04-2026 |
g-U|4 |
.6260164 |
Nest 204 dam 2 west |
PONT |
M |
>4CY |
474 |
72,7 |
136,6 |
63,7 |
20,6 |
1057 |
26B02640 |
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| 27-04-2026 |
g-U|7 |
.5641186 |
Nest g-U|4 |
PONT |
F |
>4CY |
432 |
70,0 |
133,1 |
59,2 |
17,6 |
810 |
26B02653 |
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| 04-04-2026 |
nest |
3 eggs. |
| 22-04-2026 |
nest |
3 eggs, measured. |
| 13-04-2026 |
nest |
3 eggs. |
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parents |
1x unringed Caspian Gull trapped, now male g-U|4. |
| 27-04-2026 |
nest |
3 eggs. |
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parents |
1x unringed Caspian Gull trapped, now female g-U|7. |
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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 |
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26B02640 |







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