Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Hobokense Polder | 22 October | Hobokense Polder | 22 October | |||||
| 2021 | Hobokense Polder | 22 April | Hobokense Polder | 18 October | |||||
| 2020 | Hobokense Polder | 29 October | Hobokense Polder | 29 October | |||||
| 2019 | Hobokense Polder | 30 March | Hobokense Polder | 22 September | |||||
| 2018 | Hobokense Polder | 15 April | Hobokense Polder | 31 October | |||||
| 2017 | Hobokense Polder | 30 October | Hobokense Polder | 31 October | |||||
| 2016 | Hobokense Polder | 19 March | Hobokense Polder | 30 October | |||||
| 2015 | Hobokense Polder | 10 April | Hobokense Polder | 3 October | |||||
| 2014 | Hobokense Polder | 24 March | Hobokense Polder | 23 October | |||||
| 2013 | Hobokense Polder | 4 April | Hobokense Polder | 22 October | |||||
| 2012 | Hobokense Polder | 16 April | Hobokense Polder | 28 October | |||||
| 2011 | Hobokense Polder | 17 April | Hobokense Polder | 13 October | |||||
| 2010 | Hobokense Polder | 28 April | Hobokense Polder | 7 November | |||||
| 2009 | Hobokense Polder | 3 October | Hobokense Polder | 15 October | |||||
| 2008 | Hobokense Polder | 11 October | Hobokense Polder | 2 November | |||||
| 2007 | Hobokense Polder | 9 October | Hobokense Polder | 28 October |
