Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 4 September | Honnay | 23 October | |||||
| 2018 | Honnay | 4 November | Honnay | 4 November | |||||
| 2017 | Honnay | 15 October | Honnay | 15 October | |||||
| 2016 | Honnay | 15 October | Honnay | 30 October | |||||
| 2015 | Honnay | 10 October | Honnay | 1 November | |||||
| 2014 | Honnay | 20 September | Honnay | 26 October | |||||
| 2013 | Honnay | 26 October | Honnay | 31 October | |||||
| 2012 | Honnay | 23 September | Honnay | 1 October | |||||
| 2011 | Honnay | 31 August | Honnay | 21 October | |||||
| 2008 | Honnay | 14 September | Honnay | 25 October |
