Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 29 March | |||||
| 2022 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 19 October | |||||
| 2021 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 5 November | |||||
| 2020 | Cap Gris-Nez | 4 January | Cap Gris-Nez | 6 December | |||||
| 2019 | Cap Gris-Nez | 14 August | Cap Gris-Nez | 30 October | |||||
| 2018 | Cap Gris-Nez | 9 November | Cap Gris-Nez | 9 November | |||||
| 2017 | Cap Gris-Nez | 3 September | Cap Gris-Nez | 3 September | |||||
| 2016 | Cap Gris-Nez | 30 April | Cap Gris-Nez | 30 April | |||||
| 2015 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 28 November | |||||
| 2014 | Cap Gris-Nez | 13 May | Cap Gris-Nez | 11 November | |||||
| 2013 | Cap Gris-Nez | 10 August | Cap Gris-Nez | 3 December | |||||
| 2012 | Cap Gris-Nez | 9 November | Cap Gris-Nez | 9 November | |||||
| 2011 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 12 November | |||||
| 2010 | Cap Gris-Nez | 26 December | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 24 May | Cap Gris-Nez | 24 May | |||||
| 2008 | Cap Gris-Nez | 28 August | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 21 April | Cap Gris-Nez | 18 October | |||||
| 2006 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 9 April | |||||
| 2005 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 16 November | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 20 October |
