Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2016 |  |
VRS Castricum | 21 October | |
VRS Castricum | 21 October | |||
| 2013 | |
VRS Castricum | 15 November | |
VRS Castricum | 15 November | |||
| 2007 | |
VRS Castricum | 13 December | |
VRS Castricum | 13 December | |||
| 2004 | |
VRS Castricum | 7 November | |
VRS Castricum | 9 November | |||
| 2003 | |
VRS Castricum | 6 November | |
VRS Castricum | 6 November | |||
| 2002 | |
VRS Castricum | 30 October | |
VRS Castricum | 30 October | |||
| 2001 | |
VRS Castricum | 2 November | |
VRS Castricum | 16 November | |||
| 1998 | |
VRS Castricum | 11 November | |
VRS Castricum | 11 November | |||
| 1996 | |
VRS Castricum | 27 November | |
VRS Castricum | 27 November | |||
| 1991 | |
VRS Castricum | 16 November | |
VRS Castricum | 16 November | |||
| 1979 | |
VRS Castricum | 1 January | |
VRS Castricum | 28 January | |||
| 1978 | |
VRS Castricum | 21 October | |
VRS Castricum | 29 November | |||
| 1977 | |
VRS Castricum | 25 October | |
VRS Castricum | 19 November | |||
| 1976 | |
VRS Castricum | 22 October | |
VRS Castricum | 11 November | |||
| 1975 | |
VRS Castricum | 10 October | |
VRS Castricum | 30 November | |||
| 1973 | |
VRS Castricum | 27 October | |
VRS Castricum | 11 November | |||
| 1972 | |
VRS Castricum | 17 December | |
VRS Castricum | 17 December | |||
| 1971 | |
VRS Castricum | 24 October | |
VRS Castricum | 24 October | |||
| 1967 | |
VRS Castricum | 22 October | |
VRS Castricum | 22 October |
