Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Honnay | 14 August | Honnay | 17 October | |||||
| 2018 | Honnay | 28 October | Honnay | 7 November | |||||
| 2017 | Honnay | 25 August | Honnay | 15 October | |||||
| 2013 | Honnay | 19 October | Honnay | 19 October | |||||
| 2008 | Honnay | 2 November | Honnay | 2 November | |||||
| 2006 | Honnay | 29 October | Honnay | 29 October | |||||
| 2005 | Honnay | 31 October | Honnay | 31 October | |||||
| 2001 | Honnay | 24 September | Honnay | 7 October |
