Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2016 |  |
VRS Castricum | 24 October | |
VRS Castricum | 3 November | |||
| 2012 | |
VRS Castricum | 6 November | |
VRS Castricum | 8 December | |||
| 2010 | |
VRS Castricum | 26 October | |
VRS Castricum | 26 October | |||
| 2003 | |
VRS Castricum | 10 January | |
VRS Castricum | 10 January | |||
| 1988 | |
VRS Castricum | 24 October | |
VRS Castricum | 24 October |
