Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 |  |
VRS Castricum | 26 march | |
VRS Castricum | 18 october | |||
| 2019 | |
VRS Castricum | 5 october | |
VRS Castricum | 31 october | |||
| 2018 | |
VRS Castricum | 1 march | |
VRS Castricum | 4 november | |||
| 2017 | |
VRS Castricum | 25 september | |
VRS Castricum | 25 november | |||
| 2016 | |
VRS Castricum | 14 april | |
VRS Castricum | 11 november | |||
| 2015 | |
VRS Castricum | 29 september | |
VRS Castricum | 28 october | |||
| 2013 | |
VRS Castricum | 29 september | |
VRS Castricum | 29 september | |||
| 2010 | |
VRS Castricum | 22 november | |
VRS Castricum | 28 november | |||
| 2009 | |
VRS Castricum | 20 october | |
VRS Castricum | 22 december | |||
| 2008 | |
VRS Castricum | 6 october | |
VRS Castricum | 13 november | |||
| 2007 | |
VRS Castricum | 5 october | |
VRS Castricum | 21 october | |||
| 2006 | |
VRS Castricum | 19 october | |
VRS Castricum | 25 october | |||
| 2005 | |
VRS Castricum | 11 october | |
VRS Castricum | 13 november | |||
| 2004 | |
VRS Castricum | 29 september | |
VRS Castricum | 13 october | |||
| 2003 | |
VRS Castricum | 12 october | |
VRS Castricum | 10 november | |||
| 2002 | |
VRS Castricum | 31 october | |
VRS Castricum | 31 october | |||
| 2001 | |
VRS Castricum | 2 december | |
VRS Castricum | 2 december | |||
| 2000 | |
VRS Castricum | 13 october | |
VRS Castricum | 21 october |
