Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 |  |
VRS Castricum | 28 april | |
VRS Castricum | 6 september | |||
| 2019 | |
VRS Castricum | 26 august | |
VRS Castricum | 28 august | |||
| 2018 | |
VRS Castricum | 4 august | |
VRS Castricum | 4 august | |||
| 2017 | |
VRS Castricum | 29 august | |
VRS Castricum | 29 august | |||
| 2016 | |
VRS Castricum | 18 august | |
VRS Castricum | 7 september | |||
| 2015 | |
VRS Castricum | 19 august | |
VRS Castricum | 23 september | |||
| 2014 | |
VRS Castricum | 26 april | |
VRS Castricum | 6 september | |||
| 2013 | |
VRS Castricum | 8 may | |
VRS Castricum | 19 september | |||
| 2012 | |
VRS Castricum | 14 august | |
VRS Castricum | 28 september | |||
| 2011 | |
VRS Castricum | 21 august | |
VRS Castricum | 10 september | |||
| 2010 | |
VRS Castricum | 1 september | |
VRS Castricum | 4 october | |||
| 2009 | |
VRS Castricum | 25 august | |
VRS Castricum | 6 september | |||
| 2008 | |
VRS Castricum | 17 august | |
VRS Castricum | 3 october | |||
| 2007 | |
VRS Castricum | 6 september | |
VRS Castricum | 12 september | |||
| 2006 | |
VRS Castricum | 26 august | |
VRS Castricum | 31 august | |||
| 2005 | |
VRS Castricum | 19 august | |
VRS Castricum | 11 september | |||
| 2004 | |
VRS Castricum | 14 august | |
VRS Castricum | 26 september | |||
| 2003 | |
VRS Castricum | 18 august | |
VRS Castricum | 13 october | |||
| 2002 | |
VRS Castricum | 26 august | |
VRS Castricum | 15 september | |||
| 2001 | |
VRS Castricum | 24 august | |
VRS Castricum | 18 september | |||
| 2000 | |
VRS Castricum | 5 may | |
VRS Castricum | 21 september |
