Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 22 April | |||||
| 2022 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 10 December | |||||
| 2021 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 26 December | |||||
| 2020 | Cap Gris-Nez | 22 August | Cap Gris-Nez | 24 December | |||||
| 2019 | Cap Gris-Nez | 23 February | Cap Gris-Nez | 24 November | |||||
| 2018 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 14 December | |||||
| 2017 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 3 December | |||||
| 2016 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 13 November | |||||
| 2015 | Cap Gris-Nez | 16 February | Cap Gris-Nez | 27 November | |||||
| 2014 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 29 November | |||||
| 2013 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 3 December | |||||
| 2012 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 30 December | |||||
| 2011 | Cap Gris-Nez | 16 January | Cap Gris-Nez | 28 November | |||||
| 2010 | Cap Gris-Nez | 24 January | Cap Gris-Nez | 12 December | |||||
| 2009 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 6 November | |||||
| 2008 | Cap Gris-Nez | 10 February | Cap Gris-Nez | 16 November | |||||
| 2007 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 16 December | |||||
| 2006 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 3 November | |||||
| 2005 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 19 November | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 23 October | |||||
| 1978 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November | |||||
| 1963 | Cap Gris-Nez | 21 September | Cap Gris-Nez | 22 September | |||||
| 1962 | Cap Gris-Nez | 26 September | Cap Gris-Nez | 3 October | |||||
| 1961 | Cap Gris-Nez | 17 September | Cap Gris-Nez | 17 September | |||||
| 1956 | Cap Gris-Nez | 7 October | Cap Gris-Nez | 7 October |
