Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 15 August | Honnay | 23 September | |||||
| 2020 | Honnay | 14 August | Honnay | 15 October | |||||
| 2019 | Honnay | 14 August | Honnay | 27 September | |||||
| 2018 | Honnay | 23 August | Honnay | 13 October | |||||
| 2017 | Honnay | 14 August | Honnay | 22 September | |||||
| 2016 | Honnay | 25 August | Honnay | 7 September | |||||
| 2015 | Honnay | 23 August | Honnay | 19 September | |||||
| 2012 | Honnay | 2 September | Honnay | 2 September | |||||
| 2011 | Honnay | 20 August | Honnay | 20 August | |||||
| 2008 | Honnay | 24 August | Honnay | 24 August | |||||
| 2007 | Honnay | 6 September | Honnay | 29 September | |||||
| 2005 | Honnay | 18 September | Honnay | 24 September | |||||
| 2001 | Honnay | 11 August | Honnay | 16 October | |||||
| 1997 | Honnay | 31 August | Honnay | 6 September |
