Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 6 February | Cap Gris-Nez | 27 December | |||||
| 2020 | Cap Gris-Nez | 19 February | Cap Gris-Nez | 6 December | |||||
| 2019 | Cap Gris-Nez | 23 February | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 8 December | |||||
| 2017 | Cap Gris-Nez | 28 January | Cap Gris-Nez | 3 December | |||||
| 2016 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 27 November | |||||
| 2015 | Cap Gris-Nez | 17 February | Cap Gris-Nez | 27 November | |||||
| 2014 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 7 December | |||||
| 2013 | Cap Gris-Nez | 20 February | Cap Gris-Nez | 29 November | |||||
| 2012 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 29 December | |||||
| 2011 | Cap Gris-Nez | 9 February | Cap Gris-Nez | 19 December | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 28 November | |||||
| 2009 | Cap Gris-Nez | 15 February | Cap Gris-Nez | 2 December | |||||
| 2008 | Cap Gris-Nez | 24 January | Cap Gris-Nez | 23 November | |||||
| 2007 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 11 December | |||||
| 2006 | Cap Gris-Nez | 11 January | Cap Gris-Nez | 17 December | |||||
| 2005 | Cap Gris-Nez | 11 February | Cap Gris-Nez | 17 December | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 23 October | |||||
| 1986 | Cap Gris-Nez | 18 October | Cap Gris-Nez | 18 October | |||||
| 1978 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 2 October |
