Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 4 July | |
VRS Castricum | 4 July | |||
| 2021 | |
VRS Castricum | 23 June | |
VRS Castricum | 23 June | |||
| 2020 | |
VRS Castricum | 3 June | |
VRS Castricum | 3 June | |||
| 2019 | |
VRS Castricum | 7 June | |
VRS Castricum | 7 June | |||
| 2018 | |
VRS Castricum | 21 June | |
VRS Castricum | 24 August | |||
| 2017 | |
VRS Castricum | 14 July | |
VRS Castricum | 14 July | |||
| 2016 | |
VRS Castricum | 2 June | |
VRS Castricum | 2 June | |||
| 2015 | |
VRS Castricum | 22 June | |
VRS Castricum | 22 June | |||
| 2013 | |
VRS Castricum | 12 May | |
VRS Castricum | 12 May | |||
| 2009 | |
VRS Castricum | 4 July | |
VRS Castricum | 5 July | |||
| 2008 | |
VRS Castricum | 20 June | |
VRS Castricum | 20 June | |||
| 2006 | |
VRS Castricum | 11 June | |
VRS Castricum | 11 June | |||
| 2005 | |
VRS Castricum | 4 June | |
VRS Castricum | 12 June | |||
| 2000 | |
VRS Castricum | 19 May | |
VRS Castricum | 4 June | |||
| 1999 | |
VRS Castricum | 24 May | |
VRS Castricum | 13 June | |||
| 1998 | |
VRS Castricum | 7 June | |
VRS Castricum | 7 June | |||
| 1997 | |
VRS Castricum | 6 April | |
VRS Castricum | 6 April | |||
| 1995 | |
VRS Castricum | 25 April | |
VRS Castricum | 17 June | |||
| 1994 | |
VRS Castricum | 10 April | |
VRS Castricum | 23 July | |||
| 1993 | |
VRS Castricum | 4 July | |
VRS Castricum | 15 August | |||
| 1992 | |
VRS Castricum | 26 January | |
VRS Castricum | 9 August | |||
| 1991 | |
VRS Castricum | 7 August | |
VRS Castricum | 1 September | |||
| 1990 | |
VRS Castricum | 16 March | |
VRS Castricum | 7 October | |||
| 1989 | |
VRS Castricum | 9 May | |
VRS Castricum | 15 August | |||
| 1988 | |
VRS Castricum | 8 September | |
VRS Castricum | 8 September | |||
| 1987 | |
VRS Castricum | 1 January | |
VRS Castricum | 1 January | |||
| 1986 | |
VRS Castricum | 7 February | |
VRS Castricum | 7 February | |||
| 1985 | |
VRS Castricum | 30 January | |
VRS Castricum | 15 August | |||
| 1983 | |
VRS Castricum | 29 September | |
VRS Castricum | 24 October | |||
| 1981 | |
VRS Castricum | 17 April | |
VRS Castricum | 17 April | |||
| 1979 | |
VRS Castricum | 8 January | |
VRS Castricum | 23 January | |||
| 1977 | |
VRS Castricum | 1 September | |
VRS Castricum | 1 September | |||
| 1975 | |
VRS Castricum | 27 November | |
VRS Castricum | 27 November | |||
| 1974 | |
VRS Castricum | 1 October | |
VRS Castricum | 1 October | |||
| 1970 | |
VRS Castricum | 29 November | |
VRS Castricum | 29 November |
