Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Honnay | 24 August | Honnay | 4 November | |||||
| 2019 | Honnay | 27 August | Honnay | 2 October | |||||
| 2018 | Honnay | 29 September | Honnay | 29 September | |||||
| 2017 | Honnay | 24 August | Honnay | 15 September | |||||
| 2016 | Honnay | 3 September | Honnay | 30 October | |||||
| 2014 | Honnay | 24 August | Honnay | 24 August | |||||
| 2008 | Honnay | 6 September | Honnay | 6 September | |||||
| 2007 | Honnay | 23 September | Honnay | 23 September | |||||
| 2001 | Honnay | 27 August | Honnay | 12 October |
