Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 10 September | Cap Gris-Nez | 19 November | |||||
| 2021 | Cap Gris-Nez | 16 August | Cap Gris-Nez | 4 November | |||||
| 2020 | Cap Gris-Nez | 29 August | Cap Gris-Nez | 11 October | |||||
| 2019 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 28 October | |||||
| 2017 | Cap Gris-Nez | 15 September | Cap Gris-Nez | 19 November | |||||
| 2016 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 20 October | |||||
| 2015 | Cap Gris-Nez | 19 September | Cap Gris-Nez | 21 November | |||||
| 2014 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 7 December | |||||
| 2013 | Cap Gris-Nez | 10 September | Cap Gris-Nez | 10 November | |||||
| 2012 | Cap Gris-Nez | 26 August | Cap Gris-Nez | 15 October | |||||
| 2011 | Cap Gris-Nez | 7 September | Cap Gris-Nez | 20 December | |||||
| 2010 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 26 September | |||||
| 2009 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 16 October | |||||
| 2008 | Cap Gris-Nez | 20 July | Cap Gris-Nez | 29 October | |||||
| 2007 | Cap Gris-Nez | 10 July | Cap Gris-Nez | 10 November | |||||
| 2006 | Cap Gris-Nez | 4 August | Cap Gris-Nez | 30 December | |||||
| 2005 | Cap Gris-Nez | 23 August | Cap Gris-Nez | 27 November | |||||
| 2003 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 23 October | |||||
| 1978 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 2 October | |||||
| 1960 | Cap Gris-Nez | 7 September | Cap Gris-Nez | 7 September |
