Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Honnay | 28 August | Honnay | 28 August | |||||
| 2018 | Honnay | 30 August | Honnay | 26 September | |||||
| 2017 | Honnay | 31 August | Honnay | 31 August | |||||
| 2016 | Honnay | 29 August | Honnay | 6 September | |||||
| 2007 | Honnay | 1 September | Honnay | 4 September | |||||
| 2001 | Honnay | 25 August | Honnay | 2 September |
