Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Honnay | 17 August | Honnay | 23 September | |||||
| 2020 | Honnay | 18 August | Honnay | 9 November | |||||
| 2019 | Honnay | 20 August | Honnay | 5 October | |||||
| 2018 | Honnay | 23 August | Honnay | 13 October | |||||
| 2017 | Honnay | 15 August | Honnay | 15 October | |||||
| 2016 | Honnay | 25 August | Honnay | 16 October | |||||
| 2015 | Honnay | 13 September | Honnay | 10 October | |||||
| 2014 | Honnay | 30 August | Honnay | 20 September | |||||
| 2013 | Honnay | 24 August | Honnay | 19 October | |||||
| 2012 | Honnay | 18 August | Honnay | 1 October | |||||
| 2011 | Honnay | 15 August | Honnay | 14 October | |||||
| 2010 | Honnay | 25 September | Honnay | 12 October | |||||
| 2009 | Honnay | 6 September | Honnay | 12 September | |||||
| 2008 | Honnay | 31 August | Honnay | 25 October | |||||
| 2007 | Honnay | 6 September | Honnay | 14 October | |||||
| 2006 | Honnay | 30 August | Honnay | 24 September | |||||
| 2005 | Honnay | 29 August | Honnay | 8 October | |||||
| 2001 | Honnay | 11 August | Honnay | 15 October | |||||
| 1997 | Honnay | 29 August | Honnay | 6 September |
