Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 18 January | Cap Gris-Nez | 17 September | |||||
| 2022 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 11 December | |||||
| 2021 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 21 November | |||||
| 2020 | Cap Gris-Nez | 19 February | Cap Gris-Nez | 30 December | |||||
| 2019 | Cap Gris-Nez | 19 February | Cap Gris-Nez | 6 October | |||||
| 2018 | Cap Gris-Nez | 10 February | Cap Gris-Nez | 18 November | |||||
| 2017 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 18 September | |||||
| 2016 | Cap Gris-Nez | 15 January | Cap Gris-Nez | 22 October | |||||
| 2015 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 21 September | |||||
| 2013 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 21 September | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 1 October | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 12 September | |||||
| 2009 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 12 October | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 23 September | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 24 June | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 17 November | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 5 October | |||||
| 1958 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 14 September |
