Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 |  |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 2014 | |
VRS Castricum | 10 November | |
VRS Castricum | 10 November | |||
| 2012 | |
VRS Castricum | 28 October | |
VRS Castricum | 28 October | |||
| 2010 | |
VRS Castricum | 17 November | |
VRS Castricum | 17 November | |||
| 2004 | |
VRS Castricum | 17 July | |
VRS Castricum | 1 October | |||
| 2001 | |
VRS Castricum | 15 August | |
VRS Castricum | 15 August | |||
| 1999 | |
VRS Castricum | 4 April | |
VRS Castricum | 31 July | |||
| 1998 | |
VRS Castricum | 17 May | |
VRS Castricum | 17 May | |||
| 1997 | |
VRS Castricum | 23 July | |
VRS Castricum | 31 July | |||
| 1996 | |
VRS Castricum | 21 July | |
VRS Castricum | 10 November | |||
| 1995 | |
VRS Castricum | 5 September | |
VRS Castricum | 4 November | |||
| 1994 | |
VRS Castricum | 23 July | |
VRS Castricum | 9 August | |||
| 1993 | |
VRS Castricum | 17 July | |
VRS Castricum | 29 October | |||
| 1992 | |
VRS Castricum | 30 July | |
VRS Castricum | 31 July | |||
| 1991 | |
VRS Castricum | 15 July | |
VRS Castricum | 21 November | |||
| 1990 | |
VRS Castricum | 22 April | |
VRS Castricum | 8 November | |||
| 1989 | |
VRS Castricum | 15 June | |
VRS Castricum | 25 October | |||
| 1988 | |
VRS Castricum | 19 July | |
VRS Castricum | 20 November | |||
| 1987 | |
VRS Castricum | 21 August | |
VRS Castricum | 28 November | |||
| 1986 | |
VRS Castricum | 2 August | |
VRS Castricum | 26 November | |||
| 1985 | |
VRS Castricum | 1 August | |
VRS Castricum | 9 September | |||
| 1984 | |
VRS Castricum | 10 August | |
VRS Castricum | 8 November | |||
| 1983 | |
VRS Castricum | 2 August | |
VRS Castricum | 20 October | |||
| 1982 | |
VRS Castricum | 3 August | |
VRS Castricum | 5 November | |||
| 1981 | |
VRS Castricum | 20 July | |
VRS Castricum | 9 November | |||
| 1980 | |
VRS Castricum | 10 August | |
VRS Castricum | 3 November | |||
| 1979 | |
VRS Castricum | 12 August | |
VRS Castricum | 6 October | |||
| 1978 | |
VRS Castricum | 8 August | |
VRS Castricum | 7 November | |||
| 1977 | |
VRS Castricum | 24 August | |
VRS Castricum | 13 October | |||
| 1976 | |
VRS Castricum | 18 September | |
VRS Castricum | 27 October | |||
| 1975 | |
VRS Castricum | 9 August | |
VRS Castricum | 9 August | |||
| 1973 | |
VRS Castricum | 14 October | |
VRS Castricum | 3 November | |||
| 1972 | |
VRS Castricum | 30 October | |
VRS Castricum | 1 November | |||
| 1971 | |
VRS Castricum | 5 October | |
VRS Castricum | 17 October | |||
| 1970 | |
VRS Castricum | 8 November | |
VRS Castricum | 8 November |
