Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 6 July | |
VRS Castricum | 6 July | |||
| 2021 | |
VRS Castricum | 5 July | |
VRS Castricum | 5 July | |||
| 2019 | |
VRS Castricum | 22 July | |
VRS Castricum | 22 July | |||
| 2018 | |
VRS Castricum | 13 July | |
VRS Castricum | 13 July | |||
| 2017 | |
VRS Castricum | 14 July | |
VRS Castricum | 14 July | |||
| 2016 | |
VRS Castricum | 6 July | |
VRS Castricum | 6 July | |||
| 2015 | |
VRS Castricum | 22 June | |
VRS Castricum | 9 July | |||
| 2014 | |
VRS Castricum | 5 May | |
VRS Castricum | 29 July | |||
| 2013 | |
VRS Castricum | 6 April | |
VRS Castricum | 24 April | |||
| 2012 | |
VRS Castricum | 19 July | |
VRS Castricum | 19 July | |||
| 2011 | |
VRS Castricum | 5 July | |
VRS Castricum | 25 July | |||
| 2009 | |
VRS Castricum | 12 May | |
VRS Castricum | 12 May | |||
| 2004 | |
VRS Castricum | 29 July | |
VRS Castricum | 29 July | |||
| 2003 | |
VRS Castricum | 12 June | |
VRS Castricum | 12 June | |||
| 2002 | |
VRS Castricum | 14 June | |
VRS Castricum | 14 June |
