Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 12 April | |
VRS Castricum | 12 April | |||
| 2020 | |
VRS Castricum | 9 November | |
VRS Castricum | 9 November | |||
| 2019 | |
VRS Castricum | 24 October | |
VRS Castricum | 24 October | |||
| 2018 | |
VRS Castricum | 5 March | |
VRS Castricum | 5 March | |||
| 2017 | |
VRS Castricum | 18 February | |
VRS Castricum | 18 February | |||
| 2016 | |
VRS Castricum | 28 August | |
VRS Castricum | 28 August | |||
| 2013 | |
VRS Castricum | 5 April | |
VRS Castricum | 5 April | |||
| 2012 | |
VRS Castricum | 9 February | |
VRS Castricum | 11 February | |||
| 2010 | |
VRS Castricum | 9 January | |
VRS Castricum | 30 January | |||
| 2008 | |
VRS Castricum | 20 April | |
VRS Castricum | 20 April | |||
| 2007 | |
VRS Castricum | 27 October | |
VRS Castricum | 27 October | |||
| 2006 | |
VRS Castricum | 24 August | |
VRS Castricum | 24 August | |||
| 2003 | |
VRS Castricum | 16 September | |
VRS Castricum | 16 September | |||
| 2002 | |
VRS Castricum | 21 July | |
VRS Castricum | 21 July | |||
| 1997 | |
VRS Castricum | 1 January | |
VRS Castricum | 9 January | |||
| 1996 | |
VRS Castricum | 3 January | |
VRS Castricum | 30 January | |||
| 1987 | |
VRS Castricum | 20 January | |
VRS Castricum | 20 January | |||
| 1986 | |
VRS Castricum | 9 February | |
VRS Castricum | 10 March | |||
| 1985 | |
VRS Castricum | 12 January | |
VRS Castricum | 19 February | |||
| 1984 | |
VRS Castricum | 25 January | |
VRS Castricum | 28 January | |||
| 1982 | |
VRS Castricum | 11 January | |
VRS Castricum | 11 January | |||
| 1979 | |
VRS Castricum | 3 January | |
VRS Castricum | 27 January | |||
| 1974 | |
VRS Castricum | 25 January | |
VRS Castricum | 25 January |
