Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 25 July | |
VRS Castricum | 25 July | |||
| 2021 | |
VRS Castricum | 10 February | |
VRS Castricum | 10 February | |||
| 2018 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 2017 | |
VRS Castricum | 13 February | |
VRS Castricum | 13 February | |||
| 2013 | |
VRS Castricum | 19 January | |
VRS Castricum | 26 January | |||
| 2012 | |
VRS Castricum | 3 February | |
VRS Castricum | 7 December | |||
| 2010 | |
VRS Castricum | 3 December | |
VRS Castricum | 30 December | |||
| 2009 | |
VRS Castricum | 6 January | |
VRS Castricum | 20 December | |||
| 2008 | |
VRS Castricum | 3 July | |
VRS Castricum | 31 December | |||
| 2007 | |
VRS Castricum | 11 July | |
VRS Castricum | 11 July | |||
| 2006 | |
VRS Castricum | 16 July | |
VRS Castricum | 16 July | |||
| 2005 | |
VRS Castricum | 23 July | |
VRS Castricum | 23 July | |||
| 2003 | |
VRS Castricum | 10 January | |
VRS Castricum | 10 January | |||
| 2002 | |
VRS Castricum | 6 July | |
VRS Castricum | 6 July | |||
| 2001 | |
VRS Castricum | 8 August | |
VRS Castricum | 8 August | |||
| 2000 | |
VRS Castricum | 4 July | |
VRS Castricum | 4 July | |||
| 1998 | |
VRS Castricum | 19 July | |
VRS Castricum | 19 July | |||
| 1997 | |
VRS Castricum | 9 January | |
VRS Castricum | 17 July | |||
| 1996 | |
VRS Castricum | 1 January | |
VRS Castricum | 14 July | |||
| 1995 | |
VRS Castricum | 7 January | |
VRS Castricum | 17 December | |||
| 1994 | |
VRS Castricum | 20 February | |
VRS Castricum | 3 July | |||
| 1993 | |
VRS Castricum | 1 January | |
VRS Castricum | 1 December | |||
| 1992 | |
VRS Castricum | 25 January | |
VRS Castricum | 31 December | |||
| 1991 | |
VRS Castricum | 15 January | |
VRS Castricum | 16 October | |||
| 1990 | |
VRS Castricum | 30 July | |
VRS Castricum | 18 December | |||
| 1989 | |
VRS Castricum | 1 January | |
VRS Castricum | 1 December | |||
| 1988 | |
VRS Castricum | 28 September | |
VRS Castricum | 31 December | |||
| 1987 | |
VRS Castricum | 7 January | |
VRS Castricum | 14 March | |||
| 1986 | |
VRS Castricum | 1 January | |
VRS Castricum | 24 December | |||
| 1985 | |
VRS Castricum | 6 January | |
VRS Castricum | 31 December | |||
| 1984 | |
VRS Castricum | 23 January | |
VRS Castricum | 27 January | |||
| 1983 | |
VRS Castricum | 22 August | |
VRS Castricum | 13 October | |||
| 1982 | |
VRS Castricum | 8 January | |
VRS Castricum | 29 December | |||
| 1981 | |
VRS Castricum | 27 August | |
VRS Castricum | 28 December | |||
| 1980 | |
VRS Castricum | 11 January | |
VRS Castricum | 15 October | |||
| 1979 | |
VRS Castricum | 1 January | |
VRS Castricum | 9 December | |||
| 1978 | |
VRS Castricum | 2 January | |
VRS Castricum | 24 December | |||
| 1977 | |
VRS Castricum | 6 December | |
VRS Castricum | 6 December | |||
| 1976 | |
VRS Castricum | 31 January | |
VRS Castricum | 30 December | |||
| 1975 | |
VRS Castricum | 23 November | |
VRS Castricum | 14 December | |||
| 1974 | |
VRS Castricum | 16 October | |
VRS Castricum | 16 October | |||
| 1973 | |
VRS Castricum | 16 September | |
VRS Castricum | 1 December | |||
| 1972 | |
VRS Castricum | 1 February | |
VRS Castricum | 23 December | |||
| 1971 | |
VRS Castricum | 26 September | |
VRS Castricum | 26 December | |||
| 1969 | |
VRS Castricum | 15 November | |
VRS Castricum | 15 November | |||
| 1966 | |
VRS Castricum | 8 November | |
VRS Castricum | 8 November | |||
| 1965 | |
VRS Castricum | 13 November | |
VRS Castricum | 17 November |
