Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 8 January | Cap Gris-Nez | 25 April | |||||
| 2022 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 25 November | |||||
| 2021 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 26 December | |||||
| 2020 | Cap Gris-Nez | 28 September | Cap Gris-Nez | 24 December | |||||
| 2019 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 9 December | |||||
| 2018 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 14 December | |||||
| 2017 | Cap Gris-Nez | 24 February | Cap Gris-Nez | 3 December | |||||
| 2016 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 12 November | |||||
| 2015 | Cap Gris-Nez | 26 April | Cap Gris-Nez | 25 November | |||||
| 2014 | Cap Gris-Nez | 23 October | Cap Gris-Nez | 19 December | |||||
| 2013 | Cap Gris-Nez | 17 May | Cap Gris-Nez | 9 December | |||||
| 2012 | Cap Gris-Nez | 27 October | Cap Gris-Nez | 28 November | |||||
| 2011 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 31 December | |||||
| 2010 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 12 December | |||||
| 2009 | Cap Gris-Nez | 24 January | Cap Gris-Nez | 13 December | |||||
| 2008 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 14 December | |||||
| 2007 | Cap Gris-Nez | 14 January | Cap Gris-Nez | 30 December | |||||
| 2006 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 10 December | |||||
| 2005 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 27 November | |||||
| 2004 | Cap Gris-Nez | 1 November | Cap Gris-Nez | 1 November | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 22 October | |||||
| 1986 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 22 October | |||||
| 1961 | Cap Gris-Nez | 20 September | Cap Gris-Nez | 20 September | |||||
| 1960 | Cap Gris-Nez | 8 September | Cap Gris-Nez | 8 September |
