Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Hobokense Polder | 21 march | Hobokense Polder | 15 may | |||||
| 2018 | Hobokense Polder | 31 march | Hobokense Polder | 31 october | |||||
| 2017 | Hobokense Polder | 28 march | Hobokense Polder | 3 november | |||||
| 2016 | Hobokense Polder | 19 march | Hobokense Polder | 5 november | |||||
| 2015 | Hobokense Polder | 5 april | Hobokense Polder | 31 october | |||||
| 2014 | Hobokense Polder | 15 march | Hobokense Polder | 2 november | |||||
| 2013 | Hobokense Polder | 30 march | Hobokense Polder | 25 october | |||||
| 2012 | Hobokense Polder | 8 april | Hobokense Polder | 28 october | |||||
| 2011 | Hobokense Polder | 16 april | Hobokense Polder | 28 october | |||||
| 2010 | Hobokense Polder | 18 april | Hobokense Polder | 8 november | |||||
| 2009 | Hobokense Polder | 3 october | Hobokense Polder | 3 november | |||||
| 2008 | Hobokense Polder | 2 october | Hobokense Polder | 28 october | |||||
| 2007 | Hobokense Polder | 2 october | Hobokense Polder | 6 november | |||||
| 2006 | Hobokense Polder | 27 october | Hobokense Polder | 4 november |
