Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | De Horde (Lopik) | 9 September | De Horde (Lopik) | 9 September | |||||
| 2012 | De Horde (Lopik) | 28 May | De Horde (Lopik) | 28 May | |||||
| 2011 | De Horde (Lopik) | 1 October | De Horde (Lopik) | 1 October | |||||
| 2010 | De Horde (Lopik) | 19 September | De Horde (Lopik) | 19 September | |||||
| 2007 | De Horde (Lopik) | 22 September | De Horde (Lopik) | 22 September |
