Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 6 October | Cap Gris-Nez | 12 October | |||||
| 2020 | Cap Gris-Nez | 24 December | Cap Gris-Nez | 24 December | |||||
| 2018 | Cap Gris-Nez | 27 October | Cap Gris-Nez | 9 December | |||||
| 2017 | Cap Gris-Nez | 6 October | Cap Gris-Nez | 29 October | |||||
| 2016 | Cap Gris-Nez | 2 November | Cap Gris-Nez | 2 November | |||||
| 2015 | Cap Gris-Nez | 20 October | Cap Gris-Nez | 20 November | |||||
| 2013 | Cap Gris-Nez | 10 November | Cap Gris-Nez | 19 November | |||||
| 2012 | Cap Gris-Nez | 7 October | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 8 October | Cap Gris-Nez | 28 November | |||||
| 2010 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 2009 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 12 October | |||||
| 2008 | Cap Gris-Nez | 5 April | Cap Gris-Nez | 16 November | |||||
| 2006 | Cap Gris-Nez | 9 October | Cap Gris-Nez | 9 October | |||||
| 2005 | Cap Gris-Nez | 23 October | Cap Gris-Nez | 17 November |
