Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 |  |
VRS Castricum | 19 October | |
VRS Castricum | 19 October | |||
| 2016 | |
VRS Castricum | 20 October | |
VRS Castricum | 10 November | |||
| 2014 | |
VRS Castricum | 31 October | |
VRS Castricum | 31 October | |||
| 2013 | |
VRS Castricum | 19 October | |
VRS Castricum | 19 October | |||
| 2011 | |
VRS Castricum | 28 October | |
VRS Castricum | 29 October | |||
| 2010 | |
VRS Castricum | 22 November | |
VRS Castricum | 25 November | |||
| 2007 | |
VRS Castricum | 22 October | |
VRS Castricum | 19 December | |||
| 2004 | |
VRS Castricum | 8 November | |
VRS Castricum | 8 November | |||
| 2003 | |
VRS Castricum | 30 October | |
VRS Castricum | 30 October | |||
| 2002 | |
VRS Castricum | 15 October | |
VRS Castricum | 20 October | |||
| 1996 | |
VRS Castricum | 11 October | |
VRS Castricum | 11 October | |||
| 1995 | |
VRS Castricum | 8 November | |
VRS Castricum | 8 November | |||
| 1993 | |
VRS Castricum | 16 October | |
VRS Castricum | 19 November | |||
| 1989 | |
VRS Castricum | 15 October | |
VRS Castricum | 15 October | |||
| 1987 | |
VRS Castricum | 2 October | |
VRS Castricum | 12 October | |||
| 1986 | |
VRS Castricum | 27 September | |
VRS Castricum | 4 October | |||
| 1978 | |
VRS Castricum | 18 October | |
VRS Castricum | 31 October | |||
| 1977 | |
VRS Castricum | 6 October | |
VRS Castricum | 7 October | |||
| 1976 | |
VRS Castricum | 4 November | |
VRS Castricum | 4 November | |||
| 1975 | |
VRS Castricum | 11 October | |
VRS Castricum | 15 October | |||
| 1974 | |
VRS Castricum | 4 October | |
VRS Castricum | 22 October | |||
| 1972 | |
VRS Castricum | 2 January | |
VRS Castricum | 3 November | |||
| 1971 | |
VRS Castricum | 4 October | |
VRS Castricum | 6 October | |||
| 1970 | |
VRS Castricum | 10 October | |
VRS Castricum | 29 October | |||
| 1969 | |
VRS Castricum | 11 October | |
VRS Castricum | 16 October | |||
| 1968 | |
VRS Castricum | 20 October | |
VRS Castricum | 10 November | |||
| 1967 | |
VRS Castricum | 24 September | |
VRS Castricum | 1 November | |||
| 1966 | |
VRS Castricum | 11 October | |
VRS Castricum | 31 October | |||
| 1965 | |
VRS Castricum | 10 October | |
VRS Castricum | 17 October | |||
| 1964 | |
VRS Castricum | 15 November | |
VRS Castricum | 15 November | |||
| 1963 | |
VRS Castricum | 16 October | |
VRS Castricum | 19 October | |||
| 1962 | |
VRS Castricum | 25 October | |
VRS Castricum | 25 October | |||
| 1961 | |
VRS Castricum | 31 October | |
VRS Castricum | 31 October |
