Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | De Horde (Lopik) | 24 February | De Horde (Lopik) | 24 February | |||||
| 2015 | De Horde (Lopik) | 14 March | De Horde (Lopik) | 14 March | |||||
| 2013 | De Horde (Lopik) | 26 September | De Horde (Lopik) | 26 September | |||||
| 2012 | De Horde (Lopik) | 29 January | De Horde (Lopik) | 29 January | |||||
| 2008 | De Horde (Lopik) | 24 February | De Horde (Lopik) | 25 February |
