Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 22 August | Honnay | 9 November | |||||
| 2020 | Honnay | 18 August | Honnay | 14 November | |||||
| 2019 | Honnay | 3 September | Honnay | 31 October | |||||
| 2018 | Honnay | 23 August | Honnay | 28 October | |||||
| 2017 | Honnay | 24 August | Honnay | 26 October | |||||
| 2016 | Honnay | 26 August | Honnay | 30 October | |||||
| 2015 | Honnay | 23 August | Honnay | 24 October | |||||
| 2014 | Honnay | 26 October | Honnay | 26 October | |||||
| 2013 | Honnay | 26 October | Honnay | 26 October | |||||
| 2011 | Honnay | 31 August | Honnay | 2 October | |||||
| 2008 | Honnay | 11 September | Honnay | 11 September | |||||
| 2006 | Honnay | 22 October | Honnay | 29 October | |||||
| 2005 | Honnay | 31 October | Honnay | 31 October | |||||
| 2001 | Honnay | 18 August | Honnay | 14 October |
