Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 |  |
VRS Castricum | 25 December | |
VRS Castricum | 25 December | |||
| 2018 | |
VRS Castricum | 18 February | |
VRS Castricum | 19 June | |||
| 2014 | |
VRS Castricum | 28 December | |
VRS Castricum | 28 December | |||
| 2013 | |
VRS Castricum | 12 January | |
VRS Castricum | 18 May | |||
| 2012 | |
VRS Castricum | 13 February | |
VRS Castricum | 24 December | |||
| 2011 | |
VRS Castricum | 7 January | |
VRS Castricum | 19 November | |||
| 2010 | |
VRS Castricum | 21 March | |
VRS Castricum | 30 December | |||
| 2009 | |
VRS Castricum | 3 January | |
VRS Castricum | 7 July | |||
| 2008 | |
VRS Castricum | 24 March | |
VRS Castricum | 6 July | |||
| 2007 | |
VRS Castricum | 23 January | |
VRS Castricum | 27 October | |||
| 2006 | |
VRS Castricum | 29 December | |
VRS Castricum | 29 December | |||
| 2005 | |
VRS Castricum | 22 May | |
VRS Castricum | 22 May | |||
| 2004 | |
VRS Castricum | 4 July | |
VRS Castricum | 4 July | |||
| 2003 | |
VRS Castricum | 24 January | |
VRS Castricum | 27 June | |||
| 2002 | |
VRS Castricum | 21 June | |
VRS Castricum | 21 June | |||
| 2001 | |
VRS Castricum | 14 January | |
VRS Castricum | 14 January | |||
| 2000 | |
VRS Castricum | 25 March | |
VRS Castricum | 2 October | |||
| 1999 | |
VRS Castricum | 12 March | |
VRS Castricum | 12 March | |||
| 1998 | |
VRS Castricum | 1 February | |
VRS Castricum | 24 July | |||
| 1997 | |
VRS Castricum | 23 January | |
VRS Castricum | 20 September | |||
| 1996 | |
VRS Castricum | 9 January | |
VRS Castricum | 20 September | |||
| 1995 | |
VRS Castricum | 6 January | |
VRS Castricum | 23 August | |||
| 1994 | |
VRS Castricum | 1 May | |
VRS Castricum | 24 December | |||
| 1993 | |
VRS Castricum | 15 August | |
VRS Castricum | 1 December | |||
| 1992 | |
VRS Castricum | 18 January | |
VRS Castricum | 8 June | |||
| 1991 | |
VRS Castricum | 16 January | |
VRS Castricum | 28 December | |||
| 1990 | |
VRS Castricum | 1 January | |
VRS Castricum | 19 December | |||
| 1989 | |
VRS Castricum | 1 January | |
VRS Castricum | 27 December | |||
| 1988 | |
VRS Castricum | 1 August | |
VRS Castricum | 15 October | |||
| 1987 | |
VRS Castricum | 20 January | |
VRS Castricum | 26 September | |||
| 1986 | |
VRS Castricum | 9 January | |
VRS Castricum | 17 March | |||
| 1985 | |
VRS Castricum | 20 January | |
VRS Castricum | 6 October | |||
| 1984 | |
VRS Castricum | 13 September | |
VRS Castricum | 26 December | |||
| 1983 | |
VRS Castricum | 3 August | |
VRS Castricum | 29 November | |||
| 1982 | |
VRS Castricum | 15 April | |
VRS Castricum | 4 December | |||
| 1980 | |
VRS Castricum | 13 August | |
VRS Castricum | 30 October | |||
| 1979 | |
VRS Castricum | 15 February | |
VRS Castricum | 11 August | |||
| 1978 | |
VRS Castricum | 2 October | |
VRS Castricum | 2 October | |||
| 1977 | |
VRS Castricum | 24 August | |
VRS Castricum | 12 November | |||
| 1976 | |
VRS Castricum | 14 August | |
VRS Castricum | 14 August | |||
| 1973 | |
VRS Castricum | 5 September | |
VRS Castricum | 5 September | |||
| 1965 | |
VRS Castricum | 7 October | |
VRS Castricum | 7 October |
