Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 24 January | Cap Gris-Nez | 8 April | |||||
| 2020 | Cap Gris-Nez | 25 December | Cap Gris-Nez | 25 December | |||||
| 2019 | Cap Gris-Nez | 27 February | Cap Gris-Nez | 21 March | |||||
| 2018 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 21 November | |||||
| 2017 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 16 December | |||||
| 2016 | Cap Gris-Nez | 10 February | Cap Gris-Nez | 13 November | |||||
| 2015 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 24 February | Cap Gris-Nez | 20 December | |||||
| 2013 | Cap Gris-Nez | 24 February | Cap Gris-Nez | 26 November | |||||
| 2012 | Cap Gris-Nez | 8 January | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 17 February | Cap Gris-Nez | 18 December | |||||
| 2010 | Cap Gris-Nez | 7 November | Cap Gris-Nez | 7 November | |||||
| 2009 | Cap Gris-Nez | 14 December | Cap Gris-Nez | 14 December | |||||
| 2008 | Cap Gris-Nez | 21 November | Cap Gris-Nez | 23 November | |||||
| 2007 | Cap Gris-Nez | 9 November | Cap Gris-Nez | 11 November | |||||
| 2006 | Cap Gris-Nez | 17 December | Cap Gris-Nez | 17 December |
