Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 5 November | |||||
| 2020 | Cap Gris-Nez | 12 May | Cap Gris-Nez | 26 September | |||||
| 2019 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 6 October | |||||
| 2018 | Cap Gris-Nez | 13 May | Cap Gris-Nez | 22 September | |||||
| 2017 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 8 November | |||||
| 2016 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 27 September | |||||
| 2015 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 18 September | |||||
| 2014 | Cap Gris-Nez | 19 April | Cap Gris-Nez | 20 December | |||||
| 2013 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 21 November | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 7 October | |||||
| 2011 | Cap Gris-Nez | 22 February | Cap Gris-Nez | 2 October | |||||
| 2010 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 11 December | |||||
| 2009 | Cap Gris-Nez | 18 April | Cap Gris-Nez | 30 November | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 23 November | |||||
| 2007 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 23 September | |||||
| 2006 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 12 November | |||||
| 2005 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 17 November | |||||
| 2004 | Cap Gris-Nez | 20 December | Cap Gris-Nez | 20 December | |||||
| 2003 | Cap Gris-Nez | 22 August | Cap Gris-Nez | 22 August | |||||
| 1987 | Cap Gris-Nez | 20 October | Cap Gris-Nez | 20 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1958 | Cap Gris-Nez | 7 September | Cap Gris-Nez | 7 September |
