Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 |  |
VRS Castricum | 29 May | |
VRS Castricum | 29 May | |||
| 2015 | |
VRS Castricum | 23 July | |
VRS Castricum | 23 July | |||
| 2014 | |
VRS Castricum | 26 July | |
VRS Castricum | 28 July | |||
| 2012 | |
VRS Castricum | 26 May | |
VRS Castricum | 26 May | |||
| 2011 | |
VRS Castricum | 5 July | |
VRS Castricum | 10 July | |||
| 2009 | |
VRS Castricum | 15 May | |
VRS Castricum | 9 July | |||
| 2008 | |
VRS Castricum | 12 May | |
VRS Castricum | 13 July | |||
| 2006 | |
VRS Castricum | 17 May | |
VRS Castricum | 17 May |
