Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2013 |  |
VRS Castricum | 16 september | |
VRS Castricum | 16 september | |||
| 2011 | |
VRS Castricum | 26 june | |
VRS Castricum | 16 september | |||
| 2010 | |
VRS Castricum | 30 july | |
VRS Castricum | 30 july | |||
| 2009 | |
VRS Castricum | 13 september | |
VRS Castricum | 13 september | |||
| 2008 | |
VRS Castricum | 20 september | |
VRS Castricum | 20 september | |||
| 2005 | |
VRS Castricum | 10 june | |
VRS Castricum | 8 october | |||
| 2004 | |
VRS Castricum | 9 october | |
VRS Castricum | 9 october | |||
| 2003 | |
VRS Castricum | 18 september | |
VRS Castricum | 3 october | |||
| 2002 | |
VRS Castricum | 17 may | |
VRS Castricum | 17 september | |||
| 2001 | |
VRS Castricum | 20 july | |
VRS Castricum | 20 july |
