Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | De Horde (Lopik) | 12 April | De Horde (Lopik) | 12 April | |||||
| 2020 | De Horde (Lopik) | 26 April | De Horde (Lopik) | 27 September | |||||
| 2019 | De Horde (Lopik) | 12 April | De Horde (Lopik) | 25 August | |||||
| 2017 | De Horde (Lopik) | 6 May | De Horde (Lopik) | 6 May | |||||
| 2014 | De Horde (Lopik) | 21 April | De Horde (Lopik) | 28 April | |||||
| 2011 | De Horde (Lopik) | 2 October | De Horde (Lopik) | 2 October |
