Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 28 April | |||||
| 2020 | Cap Gris-Nez | 21 May | Cap Gris-Nez | 21 May | |||||
| 2018 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 17 March | |||||
| 2017 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 27 March | |||||
| 2015 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 13 March | |||||
| 2014 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 27 April | |||||
| 2013 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 3 December | |||||
| 2012 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 31 March | |||||
| 2011 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 18 December | |||||
| 2010 | Cap Gris-Nez | 26 December | Cap Gris-Nez | 26 December | |||||
| 2008 | Cap Gris-Nez | 17 February | Cap Gris-Nez | 24 February | |||||
| 2007 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 29 April | |||||
| 2006 | Cap Gris-Nez | 27 April | Cap Gris-Nez | 14 May | |||||
| 2005 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 19 October |
