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Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Thijs Horst Leon Kelder Mars Muusse |
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location: | April 9th, 2021. | April 9th, 2021. | . |
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partner 1: | April 23rd, 2021: adult male Caspian Gull cachinnans (or hybrid?) r-K.B (more images). | ||
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pulli: | May 14th, 2021: pullus r[K.2]. | May 14th, 2021: pullus r[K.3]. | May 14th, 2021: pullus r[K.4]. |
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prey: | April 23rd, 2021: adult vomited Spike Perch 2x. | . | . |
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Visits and data.
Date: | details: | |||||
9-4-2021 | 2 eggs in nest. | egg no: | width (mm): | length (mm): | volume (cm3): | |
https://waarneming.nl/observation/210427139/ | A egg | 53.2 | 73.6 | |||
B egg | 53.2 | 72.1 | ||||
23-4-2021 | 3 eggs in nest. | egg no: | width (mm): | length (mm): | volume (cm3): | |
C egg | 51.6 | 70.9 | ||||
A egg | 53.4 | 73.7 | ||||
B egg | 53.3 | 71.9 | ||||
Attempt to trap breeding adult. Adult trapped. | metal: | tibia: | wing: | head + bill: | bill: | |
Adult male Caspian x Herring Gull hybrid type. | NLA 6.211.437 | Red-K.B | 454 | 128.3 | 48.5 | |
Adult vomited Spike Perch. | mass: | moult score: | bill height: | grey scale: | Tarsus: & Swob: | |
https://waarneming.nl/observation/211828921/ | -- | 10x0 | 17.1 | 6 | 73.1 & 1078 | |
14-5-2021 | 3 pulli in nest. | metal: | tibia: | mass (gr): | head + bill: | tarsus: |
https://waarneming.nl/observation/214663982/ | NLA 5.556.736 | r-K.2 | 281 | 69.3 | 45.8 | |
NLA 5.556.737 | r-K.3 | 260 | 62.2 | 45.3 | ||
NLA 5.556.738 | r-K.4 | 319 | 62.2 | 51.8 | ||
20-5-2021 | Found back only 1 pullus. | metal: | tibia: | mass (gr): | head + bill: | wing: |
NLA 5.556.738 | r-K.4 | 567 | 90.6 | 121.5 | ||