Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | De Horde (Lopik) | 14 April | De Horde (Lopik) | 14 April | |||||
| 2020 | De Horde (Lopik) | 13 October | De Horde (Lopik) | 13 October | |||||
| 2014 | De Horde (Lopik) | 4 October | De Horde (Lopik) | 4 October | |||||
| 2013 | De Horde (Lopik) | 17 October | De Horde (Lopik) | 17 October | |||||
| 2012 | De Horde (Lopik) | 12 October | De Horde (Lopik) | 12 October |
