Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Honnay | 14 August | Honnay | 5 September | |||||
| 2021 | Honnay | 31 August | Honnay | 14 September | |||||
| 2020 | Honnay | 29 August | Honnay | 4 September | |||||
| 2019 | Honnay | 26 August | Honnay | 15 September | |||||
| 2018 | Honnay | 4 September | Honnay | 4 September | |||||
| 2017 | Honnay | 15 August | Honnay | 17 September | |||||
| 2016 | Honnay | 25 August | Honnay | 25 August | |||||
| 2015 | Honnay | 23 August | Honnay | 23 August | |||||
| 2014 | Honnay | 30 August | Honnay | 30 August | |||||
| 2013 | Honnay | 24 August | Honnay | 24 August | |||||
| 2012 | Honnay | 29 August | Honnay | 29 August | |||||
| 2006 | Honnay | 29 August | Honnay | 30 August | |||||
| 2001 | Honnay | 18 August | Honnay | 23 September | |||||
| 1997 | Honnay | 1 September | Honnay | 2 September |
