Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 7 January | Cap Gris-Nez | 23 September | |||||
| 2020 | Cap Gris-Nez | 11 February | Cap Gris-Nez | 30 December | |||||
| 2019 | Cap Gris-Nez | 1 February | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 1 February | Cap Gris-Nez | 10 December | |||||
| 2017 | Cap Gris-Nez | 4 January | Cap Gris-Nez | 17 December | |||||
| 2016 | Cap Gris-Nez | 15 January | Cap Gris-Nez | 26 December | |||||
| 2015 | Cap Gris-Nez | 11 January | Cap Gris-Nez | 1 December | |||||
| 2014 | Cap Gris-Nez | 16 February | Cap Gris-Nez | 29 December | |||||
| 2013 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 15 December | |||||
| 2012 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 30 December | |||||
| 2011 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 30 December | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 12 December | |||||
| 2009 | Cap Gris-Nez | 24 January | Cap Gris-Nez | 30 November | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 9 December | |||||
| 2007 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 30 December | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 17 December | |||||
| 2005 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 18 December | |||||
| 2004 | Cap Gris-Nez | 8 August | Cap Gris-Nez | 15 September | |||||
| 2003 | Cap Gris-Nez | 31 July | Cap Gris-Nez | 31 July | |||||
| 2002 | Cap Gris-Nez | 21 August | Cap Gris-Nez | 22 August | |||||
| 1978 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 30 September |
