Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 |  |
VRS Castricum | 27 June | |
VRS Castricum | 27 June | |||
| 2014 | |
VRS Castricum | 3 June | |
VRS Castricum | 3 June | |||
| 2013 | |
VRS Castricum | 6 June | |
VRS Castricum | 6 June | |||
| 2012 | |
VRS Castricum | 20 May | |
VRS Castricum | 3 June | |||
| 2011 | |
VRS Castricum | 26 May | |
VRS Castricum | 14 June | |||
| 2009 | |
VRS Castricum | 30 May | |
VRS Castricum | 26 June | |||
| 2008 | |
VRS Castricum | 13 July | |
VRS Castricum | 13 July | |||
| 2004 | |
VRS Castricum | 29 July | |
VRS Castricum | 29 July |
