Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 11 March | |
VRS Castricum | 26 October | |||
| 2020 | |
VRS Castricum | 9 November | |
VRS Castricum | 14 November | |||
| 2019 | |
VRS Castricum | 29 March | |
VRS Castricum | 24 October | |||
| 2018 | |
VRS Castricum | 23 September | |
VRS Castricum | 19 October | |||
| 2017 | |
VRS Castricum | 7 November | |
VRS Castricum | 14 November | |||
| 2016 | |
VRS Castricum | 26 October | |
VRS Castricum | 31 October | |||
| 2015 | |
VRS Castricum | 4 October | |
VRS Castricum | 4 October | |||
| 2013 | |
VRS Castricum | 1 October | |
VRS Castricum | 1 October | |||
| 2011 | |
VRS Castricum | 9 October | |
VRS Castricum | 17 October | |||
| 2010 | |
VRS Castricum | 3 October | |
VRS Castricum | 3 October | |||
| 2009 | |
VRS Castricum | 14 September | |
VRS Castricum | 1 November | |||
| 2008 | |
VRS Castricum | 6 October | |
VRS Castricum | 3 November | |||
| 2007 | |
VRS Castricum | 6 October | |
VRS Castricum | 27 October | |||
| 2006 | |
VRS Castricum | 11 October | |
VRS Castricum | 19 October | |||
| 2005 | |
VRS Castricum | 5 October | |
VRS Castricum | 13 November | |||
| 2004 | |
VRS Castricum | 19 September | |
VRS Castricum | 30 November | |||
| 2003 | |
VRS Castricum | 29 March | |
VRS Castricum | 16 November | |||
| 2002 | |
VRS Castricum | 19 September | |
VRS Castricum | 16 November | |||
| 2001 | |
VRS Castricum | 13 October | |
VRS Castricum | 21 October | |||
| 2000 | |
VRS Castricum | 30 September | |
VRS Castricum | 22 October | |||
| 1999 | |
VRS Castricum | 7 October | |
VRS Castricum | 4 November | |||
| 1998 | |
VRS Castricum | 10 August | |
VRS Castricum | 10 August | |||
| 1997 | |
VRS Castricum | 16 October | |
VRS Castricum | 29 October | |||
| 1996 | |
VRS Castricum | 1 January | |
VRS Castricum | 1 December | |||
| 1991 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 1990 | |
VRS Castricum | 30 July | |
VRS Castricum | 30 July | |||
| 1989 | |
VRS Castricum | 18 November | |
VRS Castricum | 3 December | |||
| 1979 | |
VRS Castricum | 3 January | |
VRS Castricum | 3 January | |||
| 1976 | |
VRS Castricum | 2 February | |
VRS Castricum | 2 February | |||
| 1972 | |
VRS Castricum | 23 October | |
VRS Castricum | 29 October | |||
| 1971 | |
VRS Castricum | 27 October | |
VRS Castricum | 27 October | |||
| 1970 | |
VRS Castricum | 29 October | |
VRS Castricum | 6 November | |||
| 1968 | |
VRS Castricum | 20 November | |
VRS Castricum | 20 November |
