Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 15 August | Honnay | 1 November | |||||
| 2020 | Honnay | 17 August | Honnay | 3 November | |||||
| 2019 | Honnay | 16 August | Honnay | 25 October | |||||
| 2018 | Honnay | 16 August | Honnay | 26 October | |||||
| 2017 | Honnay | 14 August | Honnay | 18 October | |||||
| 2016 | Honnay | 22 September | Honnay | 9 October | |||||
| 2015 | Honnay | 23 August | Honnay | 24 October | |||||
| 2014 | Honnay | 24 August | Honnay | 26 October | |||||
| 2013 | Honnay | 24 August | Honnay | 26 October | |||||
| 2012 | Honnay | 29 August | Honnay | 1 October | |||||
| 2009 | Honnay | 12 September | Honnay | 14 October |
