Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 17 January | |
VRS Castricum | 14 February | |||
| 2020 | |
VRS Castricum | 18 October | |
VRS Castricum | 29 November | |||
| 2019 | |
VRS Castricum | 23 October | |
VRS Castricum | 14 November | |||
| 2018 | |
VRS Castricum | 19 November | |
VRS Castricum | 23 November | |||
| 2017 | |
VRS Castricum | 4 November | |
VRS Castricum | 4 December | |||
| 2016 | |
VRS Castricum | 5 November | |
VRS Castricum | 25 November | |||
| 2015 | |
VRS Castricum | 6 January | |
VRS Castricum | 23 November | |||
| 2014 | |
VRS Castricum | 7 November | |
VRS Castricum | 14 November | |||
| 2012 | |
VRS Castricum | 27 March | |
VRS Castricum | 22 November | |||
| 2011 | |
VRS Castricum | 8 November | |
VRS Castricum | 12 November | |||
| 2009 | |
VRS Castricum | 3 January | |
VRS Castricum | 21 November | |||
| 2008 | |
VRS Castricum | 3 November | |
VRS Castricum | 1 December | |||
| 2007 | |
VRS Castricum | 24 October | |
VRS Castricum | 22 November | |||
| 2005 | |
VRS Castricum | 7 November | |
VRS Castricum | 18 November | |||
| 2004 | |
VRS Castricum | 10 October | |
VRS Castricum | 12 November | |||
| 2002 | |
VRS Castricum | 4 November | |
VRS Castricum | 5 November | |||
| 2001 | |
VRS Castricum | 20 January | |
VRS Castricum | 23 December | |||
| 2000 | |
VRS Castricum | 18 November | |
VRS Castricum | 18 November | |||
| 1999 | |
VRS Castricum | 17 October | |
VRS Castricum | 17 October | |||
| 1998 | |
VRS Castricum | 3 November | |
VRS Castricum | 25 November | |||
| 1996 | |
VRS Castricum | 12 November | |
VRS Castricum | 16 November | |||
| 1994 | |
VRS Castricum | 8 November | |
VRS Castricum | 8 November | |||
| 1993 | |
VRS Castricum | 2 January | |
VRS Castricum | 2 January | |||
| 1992 | |
VRS Castricum | 25 January | |
VRS Castricum | 28 October | |||
| 1990 | |
VRS Castricum | 4 November | |
VRS Castricum | 4 November | |||
| 1988 | |
VRS Castricum | 23 October | |
VRS Castricum | 23 October | |||
| 1983 | |
VRS Castricum | 30 October | |
VRS Castricum | 30 October | |||
| 1982 | |
VRS Castricum | 23 October | |
VRS Castricum | 2 November | |||
| 1981 | |
VRS Castricum | 15 November | |
VRS Castricum | 16 December | |||
| 1980 | |
VRS Castricum | 2 November | |
VRS Castricum | 2 November | |||
| 1977 | |
VRS Castricum | 4 December | |
VRS Castricum | 4 December | |||
| 1975 | |
VRS Castricum | 15 August | |
VRS Castricum | 15 August |
