Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 10 October | |
VRS Castricum | 10 October | |||
| 2020 | |
VRS Castricum | 30 September | |
VRS Castricum | 17 October | |||
| 2011 | |
VRS Castricum | 15 October | |
VRS Castricum | 31 October |
