Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 |  |
VRS Castricum | 9 August | |
VRS Castricum | 9 August | |||
| 2017 | |
VRS Castricum | 4 March | |
VRS Castricum | 17 September | |||
| 2016 | |
VRS Castricum | 20 September | |
VRS Castricum | 20 September | |||
| 2015 | |
VRS Castricum | 12 April | |
VRS Castricum | 12 April | |||
| 2013 | |
VRS Castricum | 17 April | |
VRS Castricum | 17 April | |||
| 2012 | |
VRS Castricum | 13 February | |
VRS Castricum | 13 February | |||
| 2010 | |
VRS Castricum | 29 December | |
VRS Castricum | 29 December | |||
| 2009 | |
VRS Castricum | 30 August | |
VRS Castricum | 30 August | |||
| 2008 | |
VRS Castricum | 15 October | |
VRS Castricum | 15 October | |||
| 2007 | |
VRS Castricum | 19 June | |
VRS Castricum | 31 October | |||
| 2005 | |
VRS Castricum | 3 August | |
VRS Castricum | 3 August | |||
| 2004 | |
VRS Castricum | 18 September | |
VRS Castricum | 18 September | |||
| 2003 | |
VRS Castricum | 10 June | |
VRS Castricum | 10 June | |||
| 2002 | |
VRS Castricum | 21 September | |
VRS Castricum | 21 September | |||
| 2001 | |
VRS Castricum | 16 August | |
VRS Castricum | 16 August | |||
| 2000 | |
VRS Castricum | 7 September | |
VRS Castricum | 7 September | |||
| 1997 | |
VRS Castricum | 7 January | |
VRS Castricum | 9 January | |||
| 1996 | |
VRS Castricum | 9 February | |
VRS Castricum | 9 February | |||
| 1995 | |
VRS Castricum | 23 September | |
VRS Castricum | 23 September | |||
| 1994 | |
VRS Castricum | 20 October | |
VRS Castricum | 20 October | |||
| 1990 | |
VRS Castricum | 2 August | |
VRS Castricum | 2 August | |||
| 1989 | |
VRS Castricum | 31 January | |
VRS Castricum | 31 January |
