Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 26 February | De Horde (Lopik) | 26 February | |||||
| 2019 | De Horde (Lopik) | 20 May | De Horde (Lopik) | 20 May | |||||
| 2013 | De Horde (Lopik) | 27 April | De Horde (Lopik) | 27 April | |||||
| 2012 | De Horde (Lopik) | 7 April | De Horde (Lopik) | 11 November | |||||
| 2008 | De Horde (Lopik) | 27 September | De Horde (Lopik) | 27 September |
