Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 12 October | Cap Gris-Nez | 5 November | |||||
| 2020 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 12 October | |||||
| 2017 | Cap Gris-Nez | 13 November | Cap Gris-Nez | 14 November | |||||
| 2014 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 9 December | |||||
| 2013 | Cap Gris-Nez | 11 November | Cap Gris-Nez | 11 November | |||||
| 2012 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 3 October | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 26 December | |||||
| 2008 | Cap Gris-Nez | 8 October | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 18 October | Cap Gris-Nez | 4 November | |||||
| 2006 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 5 November | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 20 November | |||||
| 1977 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 2 October |
