Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Hobokense Polder | 28 March | Hobokense Polder | 30 September | |||||
| 2020 | Hobokense Polder | 7 October | Hobokense Polder | 10 October | |||||
| 2019 | Hobokense Polder | 21 March | Hobokense Polder | 24 October | |||||
| 2018 | Hobokense Polder | 31 March | Hobokense Polder | 19 April | |||||
| 2017 | Hobokense Polder | 28 March | Hobokense Polder | 26 October | |||||
| 2016 | Hobokense Polder | 2 April | Hobokense Polder | 4 October | |||||
| 2015 | Hobokense Polder | 5 April | Hobokense Polder | 2 May | |||||
| 2014 | Hobokense Polder | 15 March | Hobokense Polder | 27 October | |||||
| 2013 | Hobokense Polder | 30 March | Hobokense Polder | 5 May | |||||
| 2012 | Hobokense Polder | 8 April | Hobokense Polder | 7 October | |||||
| 2011 | Hobokense Polder | 16 April | Hobokense Polder | 23 October | |||||
| 2010 | Hobokense Polder | 18 April | Hobokense Polder | 29 September | |||||
| 2008 | Hobokense Polder | 20 October | Hobokense Polder | 20 October | |||||
| 2007 | Hobokense Polder | 7 October | Hobokense Polder | 27 October | |||||
| 2006 | Hobokense Polder | 27 October | Hobokense Polder | 27 October |
