Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 11 November | |||||
| 2020 | Cap Gris-Nez | 3 July | Cap Gris-Nez | 10 October | |||||
| 2019 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 10 November | |||||
| 2018 | Cap Gris-Nez | 18 February | Cap Gris-Nez | 15 November | |||||
| 2017 | Cap Gris-Nez | 28 March | Cap Gris-Nez | 14 November | |||||
| 2016 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 22 October | |||||
| 2015 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 11 November | |||||
| 2014 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 15 November | |||||
| 2013 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 5 October | |||||
| 2012 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 9 November | |||||
| 2011 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 17 December | |||||
| 2010 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 5 November | |||||
| 2008 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 11 December | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 26 November | |||||
| 2005 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 11 December | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 14 May | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October |
