Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 15 January | Cap Gris-Nez | 13 September | |||||
| 2022 | Cap Gris-Nez | 3 January | Cap Gris-Nez | 17 December | |||||
| 2021 | Cap Gris-Nez | 12 January | Cap Gris-Nez | 31 December | |||||
| 2020 | Cap Gris-Nez | 4 January | Cap Gris-Nez | 22 December | |||||
| 2019 | Cap Gris-Nez | 1 February | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 8 January | Cap Gris-Nez | 10 December | |||||
| 2017 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 17 December | |||||
| 2016 | Cap Gris-Nez | 12 January | Cap Gris-Nez | 1 December | |||||
| 2015 | Cap Gris-Nez | 11 January | Cap Gris-Nez | 1 December | |||||
| 2014 | Cap Gris-Nez | 16 February | Cap Gris-Nez | 29 December | |||||
| 2013 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 12 December | |||||
| 2012 | Cap Gris-Nez | 7 January | Cap Gris-Nez | 29 December | |||||
| 2011 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 30 December | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 4 December | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 14 December | |||||
| 2007 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 16 December | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 12 December | |||||
| 2005 | Cap Gris-Nez | 20 February | Cap Gris-Nez | 22 December | |||||
| 2004 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 20 December | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 25 October | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 23 October | |||||
| 1986 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 24 October | |||||
| 1978 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 2 October | |||||
| 1962 | Cap Gris-Nez | 5 October | Cap Gris-Nez | 5 October |
