Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 5 January | Cap Gris-Nez | 23 April | |||||
| 2021 | Cap Gris-Nez | 21 February | Cap Gris-Nez | 22 October | |||||
| 2020 | Cap Gris-Nez | 14 May | Cap Gris-Nez | 28 November | |||||
| 2019 | Cap Gris-Nez | 17 February | Cap Gris-Nez | 9 December | |||||
| 2018 | Cap Gris-Nez | 14 May | Cap Gris-Nez | 8 December | |||||
| 2017 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 18 November | |||||
| 2016 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 28 September | |||||
| 2015 | Cap Gris-Nez | 8 March | Cap Gris-Nez | 13 November | |||||
| 2014 | Cap Gris-Nez | 24 February | Cap Gris-Nez | 4 December | |||||
| 2013 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 2 November | |||||
| 2012 | Cap Gris-Nez | 22 January | Cap Gris-Nez | 6 November | |||||
| 2011 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 10 October | |||||
| 2010 | Cap Gris-Nez | 14 April | Cap Gris-Nez | 11 December | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 16 November | |||||
| 2007 | Cap Gris-Nez | 16 August | Cap Gris-Nez | 24 November | |||||
| 2006 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 26 November | |||||
| 2005 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 17 December | |||||
| 2004 | Cap Gris-Nez | 15 September | Cap Gris-Nez | 15 September | |||||
| 1961 | Cap Gris-Nez | 16 September | Cap Gris-Nez | 16 September | |||||
| 1956 | Cap Gris-Nez | 5 October | Cap Gris-Nez | 7 October |
