Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 22 April | De Horde (Lopik) | 28 April | |||||
| 2020 | De Horde (Lopik) | 18 April | De Horde (Lopik) | 18 April | |||||
| 2019 | De Horde (Lopik) | 18 April | De Horde (Lopik) | 18 April | |||||
| 2011 | De Horde (Lopik) | 13 October | De Horde (Lopik) | 13 October |
