Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 8 January | Cap Gris-Nez | 21 May | |||||
| 2022 | Cap Gris-Nez | 5 January | Cap Gris-Nez | 25 November | |||||
| 2021 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 2 December | |||||
| 2020 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 1 December | |||||
| 2019 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 11 November | |||||
| 2018 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 9 December | |||||
| 2017 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 13 November | |||||
| 2016 | Cap Gris-Nez | 15 January | Cap Gris-Nez | 27 November | |||||
| 2015 | Cap Gris-Nez | 11 January | Cap Gris-Nez | 28 November | |||||
| 2014 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 19 December | |||||
| 2013 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 12 December | |||||
| 2012 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 19 November | |||||
| 2011 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 31 December | |||||
| 2010 | Cap Gris-Nez | 3 January | Cap Gris-Nez | 25 November | |||||
| 2009 | Cap Gris-Nez | 24 January | Cap Gris-Nez | 7 November | |||||
| 2008 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 22 November | |||||
| 2007 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 11 December | |||||
| 2006 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 29 November | |||||
| 2005 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 27 November | |||||
| 2004 | Cap Gris-Nez | 16 May | Cap Gris-Nez | 16 May | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 10 May | |||||
| 1987 | Cap Gris-Nez | 18 October | Cap Gris-Nez | 18 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1962 | Cap Gris-Nez | 29 September | Cap Gris-Nez | 29 September |
