Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | De Horde (Lopik) | 22 May | De Horde (Lopik) | 22 May | |||||
| 2017 | De Horde (Lopik) | 3 September | De Horde (Lopik) | 3 September | |||||
| 2016 | De Horde (Lopik) | 8 May | De Horde (Lopik) | 9 May | |||||
| 2000 | De Horde (Lopik) | 16 May | De Horde (Lopik) | 16 May |
