Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 | De Horde (Lopik) | 16 October | De Horde (Lopik) | 16 October | |||||
| 2013 | De Horde (Lopik) | 19 October | De Horde (Lopik) | 19 October | |||||
| 2004 | De Horde (Lopik) | 10 October | De Horde (Lopik) | 10 October | |||||
| 2002 | De Horde (Lopik) | 12 November | De Horde (Lopik) | 12 November |
