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| Coordinator: Albert de Jong Merijn Loeve Roland-Jan Buijs Thijs Horst Leon Kelder Mars Muusse | 
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| partner 1: | May 20th, 2021. | . | . | 
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| pulli: | May 14th, 2021: pullus p[FR]. | June 11th, 2021: pullus p[FR]. | June 11th, 2021: pullus p[FR]. | 
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| May 14th, 2021: pullus p[FS]. | June 11th, 2021: pullus p[FS]. | June 11th, 2021: pullus p[FS]. | |
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| May 14th, 2021: pullus p[FT]. | June 11th, 2021: pullus p[FT]. | June 11th, 2021: pullus p[FT]. | |
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| prey: | May 14th, 2021: 1x Roach; 2x Eel. | May 20th, 2021: 1x Roach; 1x Rounded Goby. | June 11th, 2021: Roach 4x vomited. | 
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| June 11th, 2021: Roach 4x & Perch 1x vomited. | . | . | |
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Visits and data.
| Date: | details: | |||||
| 14-5-2021 | 3 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | tarsus: | 
| Prey: 1x Roach; 2x Eel. | NLA 5.556.713 | Pale FR | 92 | 54.6 | 31.9 | |
| https://waarneming.nl/observation/214662060/ | NLA 5.556.714 | Pale FS | 106 | 56.8 | 33.3 | |
| NLA 5.556.715 | Pale FT | 76 | 51.3 | 29.1 | ||
| 20-5-2021 | 3 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | wing: | 
| Prey: 1x Roach; 1x Rounded Goby. | NLA 5.556.713 | Pale FR | 313 | 71.1 | 52.0 | |
| https://waarneming.nl/observation/214706998/ | NLA 5.556.714 | Pale FS | 296 | 72.4 | 57.5 | |
| NLA 5.556.715 | Pale FT | 207 | 67.0 | -- | ||
| 11-6-2021 | 3 chicks in nest. | metal: | tibia: | mass (gr): | head + bill: | wing: | 
| Prey: 4x Roach & 1x Perch (vomited) | NLA 5.556.713 | Pale FR | 1094 | 117.0 | 278.5 | |
| https://waarneming.nl/observation/216984901/ | NLA 5.556.714 | Pale FS | 917 | 113.4 | 277.5 | |
| NLA 5.556.715 | Pale FT | 1104 | 114.7 | 253.0 | ||