Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Honnay | 11 August | Honnay | 16 October | |||||
| 2019 | Honnay | 4 September | Honnay | 24 October | |||||
| 2018 | Honnay | 16 August | Honnay | 13 October | |||||
| 2017 | Honnay | 9 September | Honnay | 7 October | |||||
| 2016 | Honnay | 6 September | Honnay | 22 October | |||||
| 2015 | Honnay | 23 August | Honnay | 19 September | |||||
| 2014 | Honnay | 30 August | Honnay | 30 August | |||||
| 2013 | Honnay | 21 September | Honnay | 16 October | |||||
| 2011 | Honnay | 1 October | Honnay | 1 October | |||||
| 2001 | Honnay | 22 September | Honnay | 8 October |
