Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 22 April | Cap Gris-Nez | 4 November | |||||
| 2020 | Cap Gris-Nez | 19 July | Cap Gris-Nez | 3 October | |||||
| 2019 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 30 October | |||||
| 2017 | Cap Gris-Nez | 15 October | Cap Gris-Nez | 1 November | |||||
| 2016 | Cap Gris-Nez | 8 September | Cap Gris-Nez | 8 September | |||||
| 2015 | Cap Gris-Nez | 30 May | Cap Gris-Nez | 30 May | |||||
| 2014 | Cap Gris-Nez | 11 November | Cap Gris-Nez | 11 November | |||||
| 2013 | Cap Gris-Nez | 4 September | Cap Gris-Nez | 11 November | |||||
| 2011 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 25 September | |||||
| 2010 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 6 November | Cap Gris-Nez | 6 November | |||||
| 2008 | Cap Gris-Nez | 26 April | Cap Gris-Nez | 16 September | |||||
| 2007 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 23 September | |||||
| 2005 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 11 October |
