Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 5 November | |||||
| 2020 | Cap Gris-Nez | 14 October | Cap Gris-Nez | 30 November | |||||
| 2019 | Cap Gris-Nez | 31 October | Cap Gris-Nez | 31 October | |||||
| 2018 | Cap Gris-Nez | 27 October | Cap Gris-Nez | 19 November | |||||
| 2017 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 27 March | |||||
| 2015 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 27 March | |||||
| 2013 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 11 September | |||||
| 2012 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 31 March | |||||
| 2011 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 27 November | |||||
| 2010 | Cap Gris-Nez | 9 November | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 16 October | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 17 October | |||||
| 2007 | Cap Gris-Nez | 6 November | Cap Gris-Nez | 24 November | |||||
| 2006 | Cap Gris-Nez | 27 April | Cap Gris-Nez | 10 December | |||||
| 2005 | Cap Gris-Nez | 11 February | Cap Gris-Nez | 17 November | |||||
| 1986 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 21 October | |||||
| 1978 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 30 March |
