Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Honnay | 23 September | Honnay | 9 October | |||||
| 2020 | Honnay | 21 August | Honnay | 20 September | |||||
| 2019 | Honnay | 4 September | Honnay | 4 September | |||||
| 2017 | Honnay | 9 September | Honnay | 17 September | |||||
| 2016 | Honnay | 16 October | Honnay | 16 October | |||||
| 2013 | Honnay | 26 October | Honnay | 26 October | |||||
| 2012 | Honnay | 2 September | Honnay | 2 September | |||||
| 2011 | Honnay | 10 September | Honnay | 10 September | |||||
| 2007 | Honnay | 14 October | Honnay | 14 October | |||||
| 2001 | Honnay | 14 October | Honnay | 14 October |
