Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 |  |
VRS Castricum | 9 september | |
VRS Castricum | 9 september | |||
| 2016 | |
VRS Castricum | 23 november | |
VRS Castricum | 23 november | |||
| 2012 | |
VRS Castricum | 28 october | |
VRS Castricum | 28 october | |||
| 2011 | |
VRS Castricum | 4 june | |
VRS Castricum | 4 june | |||
| 2010 | |
VRS Castricum | 22 december | |
VRS Castricum | 22 december | |||
| 2007 | |
VRS Castricum | 10 march | |
VRS Castricum | 10 march | |||
| 2006 | |
VRS Castricum | 3 october | |
VRS Castricum | 3 october | |||
| 2005 | |
VRS Castricum | 12 october | |
VRS Castricum | 12 october |
