Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 30 January | Cap Gris-Nez | 28 March | |||||
| 2022 | Cap Gris-Nez | 7 February | Cap Gris-Nez | 20 November | |||||
| 2021 | Cap Gris-Nez | 27 February | Cap Gris-Nez | 22 November | |||||
| 2020 | Cap Gris-Nez | 15 October | Cap Gris-Nez | 24 December | |||||
| 2019 | Cap Gris-Nez | 12 February | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 19 November | |||||
| 2017 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 16 December | |||||
| 2016 | Cap Gris-Nez | 18 March | Cap Gris-Nez | 27 November | |||||
| 2015 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 24 November | |||||
| 2013 | Cap Gris-Nez | 20 February | Cap Gris-Nez | 30 November | |||||
| 2012 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 20 December | |||||
| 2010 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 7 November | |||||
| 2009 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 7 November | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 15 March | |||||
| 2007 | Cap Gris-Nez | 21 January | Cap Gris-Nez | 24 November | |||||
| 2006 | Cap Gris-Nez | 25 February | Cap Gris-Nez | 10 November | |||||
| 2005 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 29 November | |||||
| 2003 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 1987 | Cap Gris-Nez | 20 October | Cap Gris-Nez | 21 October |
