Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2014 |  |
VRS Castricum | 11 October | |
VRS Castricum | 11 October | |||
| 2013 | |
VRS Castricum | 13 July | |
VRS Castricum | 13 July | |||
| 2012 | |
VRS Castricum | 5 August | |
VRS Castricum | 5 August | |||
| 2010 | |
VRS Castricum | 3 July | |
VRS Castricum | 14 August | |||
| 2008 | |
VRS Castricum | 5 August | |
VRS Castricum | 5 August | |||
| 2006 | |
VRS Castricum | 19 August | |
VRS Castricum | 19 August | |||
| 2004 | |
VRS Castricum | 1 January | |
VRS Castricum | 1 January | |||
| 2001 | |
VRS Castricum | 21 August | |
VRS Castricum | 21 August | |||
| 2000 | |
VRS Castricum | 29 July | |
VRS Castricum | 29 July | |||
| 1996 | |
VRS Castricum | 14 April | |
VRS Castricum | 8 December | |||
| 1993 | |
VRS Castricum | 17 October | |
VRS Castricum | 17 October | |||
| 1988 | |
VRS Castricum | 14 October | |
VRS Castricum | 14 October | |||
| 1987 | |
VRS Castricum | 31 August | |
VRS Castricum | 31 August | |||
| 1974 | |
VRS Castricum | 5 October | |
VRS Castricum | 5 October | |||
| 1971 | |
VRS Castricum | 25 October | |
VRS Castricum | 25 October | |||
| 1969 | |
VRS Castricum | 18 October | |
VRS Castricum | 18 October | |||
| 1967 | |
VRS Castricum | 1 October | |
VRS Castricum | 6 October | |||
| 1966 | |
VRS Castricum | 29 September | |
VRS Castricum | 14 October | |||
| 1965 | |
VRS Castricum | 10 October | |
VRS Castricum | 10 October | |||
| 1962 | |
VRS Castricum | 26 September | |
VRS Castricum | 1 November |
