Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 |  |
VRS Castricum | 5 May | |
VRS Castricum | 5 May | |||
| 2019 | |
VRS Castricum | 24 August | |
VRS Castricum | 24 August | |||
| 2018 | |
VRS Castricum | 3 August | |
VRS Castricum | 1 September | |||
| 2017 | |
VRS Castricum | 4 September | |
VRS Castricum | 4 September | |||
| 2016 | |
VRS Castricum | 24 August | |
VRS Castricum | 20 September | |||
| 2015 | |
VRS Castricum | 7 May | |
VRS Castricum | 19 August | |||
| 2014 | |
VRS Castricum | 2 August | |
VRS Castricum | 2 September | |||
| 2013 | |
VRS Castricum | 22 August | |
VRS Castricum | 23 August | |||
| 2012 | |
VRS Castricum | 4 September | |
VRS Castricum | 4 September | |||
| 2011 | |
VRS Castricum | 15 September | |
VRS Castricum | 15 September | |||
| 2009 | |
VRS Castricum | 17 May | |
VRS Castricum | 17 May | |||
| 2008 | |
VRS Castricum | 19 August | |
VRS Castricum | 6 September | |||
| 2003 | |
VRS Castricum | 20 May | |
VRS Castricum | 20 May | |||
| 2000 | |
VRS Castricum | 15 July | |
VRS Castricum | 13 August | |||
| 1995 | |
VRS Castricum | 2 September | |
VRS Castricum | 17 September | |||
| 1994 | |
VRS Castricum | 22 August | |
VRS Castricum | 30 August | |||
| 1993 | |
VRS Castricum | 7 September | |
VRS Castricum | 7 September | |||
| 1991 | |
VRS Castricum | 17 August | |
VRS Castricum | 17 August | |||
| 1989 | |
VRS Castricum | 5 August | |
VRS Castricum | 24 August | |||
| 1988 | |
VRS Castricum | 1 June | |
VRS Castricum | 3 September | |||
| 1987 | |
VRS Castricum | 28 May | |
VRS Castricum | 7 August | |||
| 1986 | |
VRS Castricum | 8 September | |
VRS Castricum | 8 September | |||
| 1985 | |
VRS Castricum | 2 August | |
VRS Castricum | 23 August | |||
| 1984 | |
VRS Castricum | 1 September | |
VRS Castricum | 1 September | |||
| 1983 | |
VRS Castricum | 2 August | |
VRS Castricum | 6 September | |||
| 1982 | |
VRS Castricum | 26 August | |
VRS Castricum | 26 August |
