Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 16 March | Cap Gris-Nez | 1 May | |||||
| 2022 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 29 November | |||||
| 2021 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 5 December | |||||
| 2020 | Cap Gris-Nez | 12 October | Cap Gris-Nez | 12 October | |||||
| 2019 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 5 September | |||||
| 2018 | Cap Gris-Nez | 23 October | Cap Gris-Nez | 2 November | |||||
| 2017 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 19 November | |||||
| 2016 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 10 November | |||||
| 2015 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 25 November | |||||
| 2014 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 10 November | |||||
| 2013 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 13 November | |||||
| 2012 | Cap Gris-Nez | 19 September | Cap Gris-Nez | 9 November | |||||
| 2011 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 20 November | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 22 March | Cap Gris-Nez | 5 November | |||||
| 2008 | Cap Gris-Nez | 18 March | Cap Gris-Nez | 29 October | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 24 November | |||||
| 2006 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 26 November | |||||
| 2005 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 29 November | |||||
| 1987 | Cap Gris-Nez | 22 October | Cap Gris-Nez | 22 October | |||||
| 1977 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November | |||||
| 1962 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 25 September | |||||
| 1958 | Cap Gris-Nez | 10 September | Cap Gris-Nez | 10 September |
