Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 29 September | Cap Gris-Nez | 5 November | |||||
| 2020 | Cap Gris-Nez | 27 September | Cap Gris-Nez | 1 December | |||||
| 2019 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 11 November | |||||
| 2018 | Cap Gris-Nez | 9 December | Cap Gris-Nez | 9 December | |||||
| 2017 | Cap Gris-Nez | 14 September | Cap Gris-Nez | 26 November | |||||
| 2016 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 2 October | |||||
| 2015 | Cap Gris-Nez | 20 November | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 5 October | Cap Gris-Nez | 10 December | |||||
| 2013 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 10 November | |||||
| 2012 | Cap Gris-Nez | 14 October | Cap Gris-Nez | 15 October | |||||
| 2011 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 18 December | |||||
| 2010 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 6 November | |||||
| 2009 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 16 October | |||||
| 2008 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 22 November | |||||
| 2007 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 11 November | |||||
| 2006 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 12 November | |||||
| 2005 | Cap Gris-Nez | 30 October | Cap Gris-Nez | 27 November | |||||
| 1987 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 21 October |
