Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 4 December | |||||
| 2018 | Cap Gris-Nez | 6 December | Cap Gris-Nez | 6 December | |||||
| 2017 | Cap Gris-Nez | 23 October | Cap Gris-Nez | 23 October | |||||
| 2016 | Cap Gris-Nez | 11 November | Cap Gris-Nez | 11 November | |||||
| 2014 | Cap Gris-Nez | 27 November | Cap Gris-Nez | 27 November | |||||
| 2013 | Cap Gris-Nez | 17 November | Cap Gris-Nez | 22 November | |||||
| 2011 | Cap Gris-Nez | 26 October | Cap Gris-Nez | 26 October | |||||
| 2009 | Cap Gris-Nez | 12 October | Cap Gris-Nez | 12 October | |||||
| 2008 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 25 October | |||||
| 2007 | Cap Gris-Nez | 4 November | Cap Gris-Nez | 4 November | |||||
| 2006 | Cap Gris-Nez | 7 January | Cap Gris-Nez | 10 December | |||||
| 2005 | Cap Gris-Nez | 29 October | Cap Gris-Nez | 10 November | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 23 October |
