Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Honnay | 6 August | Honnay | 24 September | |||||
| 2021 | Honnay | 31 August | Honnay | 18 September | |||||
| 2020 | Honnay | 29 August | Honnay | 27 October | |||||
| 2019 | Honnay | 10 August | Honnay | 22 September | |||||
| 2018 | Honnay | 18 August | Honnay | 22 September | |||||
| 2017 | Honnay | 22 August | Honnay | 22 August | |||||
| 2016 | Honnay | 27 August | Honnay | 27 August | |||||
| 2013 | Honnay | 27 August | Honnay | 27 August | |||||
| 2012 | Honnay | 29 August | Honnay | 27 September | |||||
| 2011 | Honnay | 20 August | Honnay | 20 August | |||||
| 1997 | Honnay | 5 September | Honnay | 5 September |
