Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 31 August | Honnay | 13 November | |||||
| 2020 | Honnay | 18 August | Honnay | 12 November | |||||
| 2019 | Honnay | 20 August | Honnay | 8 November | |||||
| 2018 | Honnay | 16 August | Honnay | 14 November | |||||
| 2017 | Honnay | 22 September | Honnay | 15 October | |||||
| 2016 | Honnay | 21 September | Honnay | 13 November | |||||
| 2015 | Honnay | 19 September | Honnay | 18 October | |||||
| 2013 | Honnay | 26 October | Honnay | 26 October | |||||
| 2011 | Honnay | 16 August | Honnay | 22 October | |||||
| 2010 | Honnay | 24 October | Honnay | 24 October | |||||
| 2009 | Honnay | 6 September | Honnay | 6 September | |||||
| 2001 | Honnay | 21 September | Honnay | 21 September |
