Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 22 November | De Horde (Lopik) | 22 November | |||||
| 2015 | De Horde (Lopik) | 10 May | De Horde (Lopik) | 10 May | |||||
| 2013 | De Horde (Lopik) | 24 October | De Horde (Lopik) | 24 October | |||||
| 2012 | De Horde (Lopik) | 28 April | De Horde (Lopik) | 28 April | |||||
| 2008 | De Horde (Lopik) | 20 April | De Horde (Lopik) | 20 April |
