Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2013 |  |
VRS Castricum | 25 August | |
VRS Castricum | 25 August | |||
| 2008 | |
VRS Castricum | 27 December | |
VRS Castricum | 27 December | |||
| 2006 | |
VRS Castricum | 1 September | |
VRS Castricum | 1 September | |||
| 2003 | |
VRS Castricum | 23 August | |
VRS Castricum | 23 August | |||
| 2001 | |
VRS Castricum | 13 September | |
VRS Castricum | 13 September | |||
| 2000 | |
VRS Castricum | 30 August | |
VRS Castricum | 30 August | |||
| 1999 | |
VRS Castricum | 21 August | |
VRS Castricum | 22 August | |||
| 1998 | |
VRS Castricum | 30 August | |
VRS Castricum | 13 September | |||
| 1996 | |
VRS Castricum | 14 September | |
VRS Castricum | 20 September | |||
| 1995 | |
VRS Castricum | 4 September | |
VRS Castricum | 4 September | |||
| 1993 | |
VRS Castricum | 3 July | |
VRS Castricum | 3 September | |||
| 1992 | |
VRS Castricum | 26 July | |
VRS Castricum | 22 August | |||
| 1991 | |
VRS Castricum | 19 August | |
VRS Castricum | 2 September | |||
| 1990 | |
VRS Castricum | 16 July | |
VRS Castricum | 16 September | |||
| 1989 | |
VRS Castricum | 25 August | |
VRS Castricum | 25 August | |||
| 1986 | |
VRS Castricum | 9 September | |
VRS Castricum | 9 September |
