Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 23 August | De Horde (Lopik) | 28 October | |||||
| 2019 | De Horde (Lopik) | 8 October | De Horde (Lopik) | 8 October | |||||
| 2015 | De Horde (Lopik) | 29 August | De Horde (Lopik) | 29 August | |||||
| 2006 | De Horde (Lopik) | 4 October | De Horde (Lopik) | 4 October | |||||
| 2003 | De Horde (Lopik) | 5 September | De Horde (Lopik) | 5 September |
