Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Honnay | 16 August | Honnay | 3 October | |||||
| 2018 | Honnay | 30 August | Honnay | 26 September | |||||
| 2017 | Honnay | 9 September | Honnay | 16 September | |||||
| 2016 | Honnay | 25 August | Honnay | 4 October | |||||
| 2015 | Honnay | 23 August | Honnay | 19 September | |||||
| 2014 | Honnay | 29 August | Honnay | 30 August | |||||
| 2012 | Honnay | 18 August | Honnay | 1 October | |||||
| 2011 | Honnay | 10 September | Honnay | 10 September |
