Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 |  |
VRS Castricum | 21 September | |
VRS Castricum | 15 October | |||
| 2016 | |
VRS Castricum | 8 October | |
VRS Castricum | 11 October | |||
| 2015 | |
VRS Castricum | 7 October | |
VRS Castricum | 7 October | |||
| 2013 | |
VRS Castricum | 30 September | |
VRS Castricum | 19 October | |||
| 2012 | |
VRS Castricum | 18 September | |
VRS Castricum | 11 November | |||
| 2011 | |
VRS Castricum | 4 October | |
VRS Castricum | 4 October | |||
| 2010 | |
VRS Castricum | 5 October | |
VRS Castricum | 5 October | |||
| 2009 | |
VRS Castricum | 21 September | |
VRS Castricum | 6 November | |||
| 2005 | |
VRS Castricum | 20 September | |
VRS Castricum | 12 October | |||
| 2003 | |
VRS Castricum | 30 September | |
VRS Castricum | 30 September | |||
| 2002 | |
VRS Castricum | 11 October | |
VRS Castricum | 11 October | |||
| 2000 | |
VRS Castricum | 21 October | |
VRS Castricum | 21 October | |||
| 1998 | |
VRS Castricum | 6 November | |
VRS Castricum | 6 November | |||
| 1996 | |
VRS Castricum | 25 September | |
VRS Castricum | 9 October | |||
| 1995 | |
VRS Castricum | 1 October | |
VRS Castricum | 16 October | |||
| 1994 | |
VRS Castricum | 25 September | |
VRS Castricum | 8 October | |||
| 1993 | |
VRS Castricum | 21 September | |
VRS Castricum | 21 September | |||
| 1991 | |
VRS Castricum | 29 September | |
VRS Castricum | 29 September | |||
| 1990 | |
VRS Castricum | 2 October | |
VRS Castricum | 2 October | |||
| 1989 | |
VRS Castricum | 12 September | |
VRS Castricum | 27 October | |||
| 1988 | |
VRS Castricum | 2 October | |
VRS Castricum | 2 October | |||
| 1987 | |
VRS Castricum | 2 October | |
VRS Castricum | 2 October | |||
| 1978 | |
VRS Castricum | 18 October | |
VRS Castricum | 18 October | |||
| 1975 | |
VRS Castricum | 13 October | |
VRS Castricum | 13 October | |||
| 1970 | |
VRS Castricum | 25 October | |
VRS Castricum | 25 October |
