Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2016 |  |
VRS Castricum | 21 May | |
VRS Castricum | 21 May | |||
| 2014 | |
VRS Castricum | 14 May | |
VRS Castricum | 29 October | |||
| 2013 | |
VRS Castricum | 16 January | |
VRS Castricum | 7 July | |||
| 2012 | |
VRS Castricum | 26 May | |
VRS Castricum | 15 December | |||
| 2011 | |
VRS Castricum | 7 January | |
VRS Castricum | 21 July | |||
| 2010 | |
VRS Castricum | 13 February | |
VRS Castricum | 29 December | |||
| 2009 | |
VRS Castricum | 4 May | |
VRS Castricum | 18 September | |||
| 2008 | |
VRS Castricum | 7 June | |
VRS Castricum | 26 August | |||
| 2007 | |
VRS Castricum | 26 May | |
VRS Castricum | 26 May | |||
| 2006 | |
VRS Castricum | 22 March | |
VRS Castricum | 9 July | |||
| 2005 | |
VRS Castricum | 27 May | |
VRS Castricum | 27 May | |||
| 2003 | |
VRS Castricum | 26 June | |
VRS Castricum | 26 June | |||
| 2002 | |
VRS Castricum | 13 January | |
VRS Castricum | 15 June | |||
| 2001 | |
VRS Castricum | 14 January | |
VRS Castricum | 22 January | |||
| 2000 | |
VRS Castricum | 5 January | |
VRS Castricum | 19 June | |||
| 1999 | |
VRS Castricum | 12 January | |
VRS Castricum | 12 March | |||
| 1998 | |
VRS Castricum | 26 January | |
VRS Castricum | 18 July | |||
| 1997 | |
VRS Castricum | 27 February | |
VRS Castricum | 11 June | |||
| 1996 | |
VRS Castricum | 2 February | |
VRS Castricum | 29 February | |||
| 1995 | |
VRS Castricum | 11 February | |
VRS Castricum | 17 June | |||
| 1994 | |
VRS Castricum | 3 July | |
VRS Castricum | 3 July | |||
| 1991 | |
VRS Castricum | 15 December | |
VRS Castricum | 15 December | |||
| 1985 | |
VRS Castricum | 24 October | |
VRS Castricum | 24 October | |||
| 1979 | |
VRS Castricum | 5 January | |
VRS Castricum | 5 January | |||
| 1978 | |
VRS Castricum | 6 December | |
VRS Castricum | 23 December | |||
| 1961 | |
VRS Castricum | 13 October | |
VRS Castricum | 13 October |
