Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2016 | De Horde (Lopik) | 10 October | De Horde (Lopik) | 10 October | |||||
| 2012 | De Horde (Lopik) | 15 September | De Horde (Lopik) | 30 September | |||||
| 2008 | De Horde (Lopik) | 31 October | De Horde (Lopik) | 31 October | |||||
| 2007 | De Horde (Lopik) | 8 September | De Horde (Lopik) | 8 September | |||||
| 2002 | De Horde (Lopik) | 19 October | De Horde (Lopik) | 19 October |
