Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 18 September | Honnay | 8 November | |||||
| 2020 | Honnay | 19 September | Honnay | 11 October | |||||
| 2019 | Honnay | 19 August | Honnay | 23 October | |||||
| 2018 | Honnay | 26 August | Honnay | 14 October | |||||
| 2017 | Honnay | 25 October | Honnay | 25 October | |||||
| 2016 | Honnay | 19 September | Honnay | 5 October | |||||
| 2012 | Honnay | 27 September | Honnay | 27 September | |||||
| 2011 | Honnay | 16 August | Honnay | 16 October | |||||
| 2005 | Honnay | 28 September | Honnay | 31 October | |||||
| 2001 | Honnay | 11 August | Honnay | 12 October |
