Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 7 June | De Horde (Lopik) | 7 June | |||||
| 2019 | De Horde (Lopik) | 24 August | De Horde (Lopik) | 24 August | |||||
| 2018 | De Horde (Lopik) | 25 March | De Horde (Lopik) | 21 April | |||||
| 2017 | De Horde (Lopik) | 12 March | De Horde (Lopik) | 11 June | |||||
| 2016 | De Horde (Lopik) | 1 April | De Horde (Lopik) | 29 October | |||||
| 2015 | De Horde (Lopik) | 9 April | De Horde (Lopik) | 25 October | |||||
| 2013 | De Horde (Lopik) | 5 March | De Horde (Lopik) | 22 October | |||||
| 2012 | De Horde (Lopik) | 22 March | De Horde (Lopik) | 7 October | |||||
| 2011 | De Horde (Lopik) | 19 March | De Horde (Lopik) | 14 October |
