Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 |  |
VRS Castricum | 1 December | |
VRS Castricum | 1 December | |||
| 2005 | |
VRS Castricum | 13 November | |
VRS Castricum | 13 November | |||
| 1996 | |
VRS Castricum | 28 November | |
VRS Castricum | 28 November | |||
| 1995 | |
VRS Castricum | 26 November | |
VRS Castricum | 26 November | |||
| 1988 | |
VRS Castricum | 19 November | |
VRS Castricum | 26 November | |||
| 1987 | |
VRS Castricum | 27 January | |
VRS Castricum | 27 January | |||
| 1975 | |
VRS Castricum | 21 November | |
VRS Castricum | 17 December |
