Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Honnay | 27 August | Honnay | 26 October | |||||
| 2021 | Honnay | 15 August | Honnay | 24 October | |||||
| 2020 | Honnay | 18 August | Honnay | 22 October | |||||
| 2019 | Honnay | 16 August | Honnay | 31 October | |||||
| 2018 | Honnay | 16 August | Honnay | 18 November | |||||
| 2017 | Honnay | 22 August | Honnay | 25 October | |||||
| 2015 | Honnay | 23 August | Honnay | 1 November | |||||
| 2014 | Honnay | 4 October | Honnay | 4 October | |||||
| 2012 | Honnay | 18 August | Honnay | 1 October | |||||
| 2011 | Honnay | 10 September | Honnay | 10 September | |||||
| 2010 | Honnay | 21 August | Honnay | 22 August | |||||
| 2008 | Honnay | 30 August | Honnay | 11 October | |||||
| 2005 | Honnay | 29 August | Honnay | 9 October | |||||
| 2001 | Honnay | 8 August | Honnay | 14 October | |||||
| 1997 | Honnay | 5 September | Honnay | 5 September |
