Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Honnay | 14 August | Honnay | 24 September | |||||
| 2019 | Honnay | 19 August | Honnay | 29 October | |||||
| 2018 | Honnay | 16 August | Honnay | 21 October | |||||
| 2017 | Honnay | 30 August | Honnay | 22 September | |||||
| 2016 | Honnay | 30 October | Honnay | 30 October | |||||
| 2015 | Honnay | 13 September | Honnay | 19 September | |||||
| 2014 | Honnay | 24 August | Honnay | 24 August | |||||
| 2012 | Honnay | 1 October | Honnay | 1 October | |||||
| 2010 | Honnay | 21 August | Honnay | 21 August | |||||
| 2001 | Honnay | 11 August | Honnay | 14 October |
