Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 9 January | De Horde (Lopik) | 17 October | |||||
| 2020 | De Horde (Lopik) | 12 October | De Horde (Lopik) | 12 October | |||||
| 2019 | De Horde (Lopik) | 17 March | De Horde (Lopik) | 17 March | |||||
| 2018 | De Horde (Lopik) | 20 August | De Horde (Lopik) | 20 August | |||||
| 2016 | De Horde (Lopik) | 29 March | De Horde (Lopik) | 29 March | |||||
| 2007 | De Horde (Lopik) | 13 April | De Horde (Lopik) | 31 July |
