Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 16 February | Cap Gris-Nez | 4 November | |||||
| 2020 | Cap Gris-Nez | 11 July | Cap Gris-Nez | 26 September | |||||
| 2019 | Cap Gris-Nez | 4 May | Cap Gris-Nez | 11 August | |||||
| 2018 | Cap Gris-Nez | 11 September | Cap Gris-Nez | 16 September | |||||
| 2017 | Cap Gris-Nez | 14 September | Cap Gris-Nez | 3 October | |||||
| 2016 | Cap Gris-Nez | 17 September | Cap Gris-Nez | 17 September | |||||
| 2015 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 16 November | |||||
| 2014 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 26 September | |||||
| 2013 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 10 October | |||||
| 2012 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 30 September | |||||
| 2011 | Cap Gris-Nez | 26 April | Cap Gris-Nez | 6 October | |||||
| 2010 | Cap Gris-Nez | 3 January | Cap Gris-Nez | 17 November | |||||
| 2009 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 5 September | |||||
| 2008 | Cap Gris-Nez | 18 May | Cap Gris-Nez | 1 October | |||||
| 2007 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 11 November | |||||
| 2006 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 9 October | |||||
| 2005 | Cap Gris-Nez | 11 May | Cap Gris-Nez | 10 October | |||||
| 1977 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November |
