Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 2 November | |
VRS Castricum | 10 November | |||
| 2020 | |
VRS Castricum | 14 November | |
VRS Castricum | 29 December | |||
| 2019 | |
VRS Castricum | 20 October | |
VRS Castricum | 22 November | |||
| 2012 | |
VRS Castricum | 27 October | |
VRS Castricum | 28 October | |||
| 2010 | |
VRS Castricum | 7 November | |
VRS Castricum | 7 November | |||
| 2009 | |
VRS Castricum | 11 November | |
VRS Castricum | 11 November | |||
| 2007 | |
VRS Castricum | 22 October | |
VRS Castricum | 22 October | |||
| 2006 | |
VRS Castricum | 26 November | |
VRS Castricum | 26 November | |||
| 2005 | |
VRS Castricum | 29 October | |
VRS Castricum | 29 October | |||
| 2003 | |
VRS Castricum | 16 October | |
VRS Castricum | 9 November | |||
| 2000 | |
VRS Castricum | 5 November | |
VRS Castricum | 7 November |
