Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 |  |
VRS Castricum | 7 November | |
VRS Castricum | 8 November | |||
| 2018 | |
VRS Castricum | 9 January | |
VRS Castricum | 17 November | |||
| 2017 | |
VRS Castricum | 7 November | |
VRS Castricum | 14 November | |||
| 2016 | |
VRS Castricum | 3 November | |
VRS Castricum | 7 November | |||
| 2013 | |
VRS Castricum | 18 October | |
VRS Castricum | 13 November | |||
| 2012 | |
VRS Castricum | 23 September | |
VRS Castricum | 23 September | |||
| 2011 | |
VRS Castricum | 26 March | |
VRS Castricum | 26 March | |||
| 2010 | |
VRS Castricum | 22 October | |
VRS Castricum | 17 November | |||
| 2009 | |
VRS Castricum | 15 December | |
VRS Castricum | 15 December | |||
| 2007 | |
VRS Castricum | 27 November | |
VRS Castricum | 27 November | |||
| 2005 | |
VRS Castricum | 13 November | |
VRS Castricum | 22 November | |||
| 2003 | |
VRS Castricum | 23 October | |
VRS Castricum | 5 November | |||
| 2000 | |
VRS Castricum | 5 November | |
VRS Castricum | 5 November | |||
| 1999 | |
VRS Castricum | 4 November | |
VRS Castricum | 21 November | |||
| 1997 | |
VRS Castricum | 21 October | |
VRS Castricum | 21 October | |||
| 1996 | |
VRS Castricum | 22 October | |
VRS Castricum | 22 October | |||
| 1995 | |
VRS Castricum | 6 November | |
VRS Castricum | 27 December | |||
| 1990 | |
VRS Castricum | 15 May | |
VRS Castricum | 6 December | |||
| 1989 | |
VRS Castricum | 18 October | |
VRS Castricum | 18 October | |||
| 1988 | |
VRS Castricum | 2 October | |
VRS Castricum | 25 November | |||
| 1987 | |
VRS Castricum | 2 November | |
VRS Castricum | 2 November | |||
| 1986 | |
VRS Castricum | 28 September | |
VRS Castricum | 28 September | |||
| 1984 | |
VRS Castricum | 9 November | |
VRS Castricum | 9 November | |||
| 1982 | |
VRS Castricum | 29 November | |
VRS Castricum | 29 November | |||
| 1980 | |
VRS Castricum | 27 September | |
VRS Castricum | 27 September | |||
| 1973 | |
VRS Castricum | 12 October | |
VRS Castricum | 2 November | |||
| 1972 | |
VRS Castricum | 14 November | |
VRS Castricum | 3 December | |||
| 1970 | |
VRS Castricum | 9 October | |
VRS Castricum | 25 November | |||
| 1968 | |
VRS Castricum | 25 October | |
VRS Castricum | 30 October | |||
| 1967 | |
VRS Castricum | 4 October | |
VRS Castricum | 6 October | |||
| 1966 | |
VRS Castricum | 15 November | |
VRS Castricum | 15 November | |||
| 1965 | |
VRS Castricum | 12 November | |
VRS Castricum | 12 November | |||
| 1963 | |
VRS Castricum | 9 October | |
VRS Castricum | 9 October | |||
| 1962 | |
VRS Castricum | 19 October | |
VRS Castricum | 14 November | |||
| 1961 | |
VRS Castricum | 29 October | |
VRS Castricum | 25 November |
