Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | De Horde (Lopik) | 7 April | De Horde (Lopik) | 7 April | |||||
| 2015 | De Horde (Lopik) | 9 May | De Horde (Lopik) | 9 May | |||||
| 2010 | De Horde (Lopik) | 16 April | De Horde (Lopik) | 16 April | |||||
| 2007 | De Horde (Lopik) | 10 May | De Horde (Lopik) | 10 May | |||||
| 2004 | De Horde (Lopik) | 26 October | De Horde (Lopik) | 26 October |
