Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 27 April | Cap Gris-Nez | 4 May | |||||
| 2022 | Cap Gris-Nez | 22 April | Cap Gris-Nez | 28 April | |||||
| 2021 | Cap Gris-Nez | 3 August | Cap Gris-Nez | 28 September | |||||
| 2020 | Cap Gris-Nez | 30 December | Cap Gris-Nez | 30 December | |||||
| 2019 | Cap Gris-Nez | 2 August | Cap Gris-Nez | 2 October | |||||
| 2018 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 2 November | |||||
| 2017 | Cap Gris-Nez | 29 April | Cap Gris-Nez | 21 October | |||||
| 2016 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 12 November | |||||
| 2015 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 9 November | |||||
| 2014 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 15 September | |||||
| 2013 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 28 September | |||||
| 2012 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 12 September | |||||
| 2011 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 20 October | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 25 October | |||||
| 2009 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 11 October | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 31 August | |||||
| 2007 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 17 August | |||||
| 2006 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 21 October | |||||
| 2005 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 31 August | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 21 October | |||||
| 1977 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November | |||||
| 1963 | Cap Gris-Nez | 26 August | Cap Gris-Nez | 23 September | |||||
| 1962 | Cap Gris-Nez | 22 September | Cap Gris-Nez | 5 October | |||||
| 1960 | Cap Gris-Nez | 12 September | Cap Gris-Nez | 12 September | |||||
| 1958 | Cap Gris-Nez | 10 September | Cap Gris-Nez | 11 September |
