Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 7 February | Cap Gris-Nez | 27 December | |||||
| 2020 | Cap Gris-Nez | 13 May | Cap Gris-Nez | 9 December | |||||
| 2019 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 21 November | |||||
| 2017 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 3 December | |||||
| 2016 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 11 November | |||||
| 2015 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 22 November | |||||
| 2013 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 12 December | |||||
| 2012 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 2 December | |||||
| 2011 | Cap Gris-Nez | 12 February | Cap Gris-Nez | 17 December | |||||
| 2010 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 25 November | |||||
| 2009 | Cap Gris-Nez | 22 February | Cap Gris-Nez | 6 November | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 22 November | |||||
| 2007 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 11 December | |||||
| 2006 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 10 December | |||||
| 2005 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 11 December | |||||
| 2004 | Cap Gris-Nez | 5 October | Cap Gris-Nez | 5 October | |||||
| 1987 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 21 October | |||||
| 1982 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 10 April | |||||
| 1978 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November | |||||
| 1956 | Cap Gris-Nez | 6 October | Cap Gris-Nez | 6 October |
