Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 4 March | Cap Gris-Nez | 4 November | |||||
| 2020 | Cap Gris-Nez | 19 February | Cap Gris-Nez | 1 December | |||||
| 2019 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 24 November | |||||
| 2018 | Cap Gris-Nez | 5 May | Cap Gris-Nez | 18 November | |||||
| 2017 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 26 November | |||||
| 2016 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 2 October | |||||
| 2015 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 21 November | |||||
| 2014 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 11 December | |||||
| 2013 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 20 November | |||||
| 2012 | Cap Gris-Nez | 19 February | Cap Gris-Nez | 18 September | |||||
| 2011 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 17 December | |||||
| 2010 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 9 November | |||||
| 2009 | Cap Gris-Nez | 22 March | Cap Gris-Nez | 30 November | |||||
| 2008 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 22 November | |||||
| 2007 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 7 November | |||||
| 2006 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 12 December | |||||
| 2005 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 25 November | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 16 May |
