Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 | Honnay | 9 September | Honnay | 9 September | |||||
| 2016 | Honnay | 4 September | Honnay | 16 October | |||||
| 2015 | Honnay | 19 September | Honnay | 19 September | |||||
| 2014 | Honnay | 26 October | Honnay | 26 October | |||||
| 2011 | Honnay | 14 October | Honnay | 14 October | |||||
| 2005 | Honnay | 23 September | Honnay | 23 September |
