Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Cap Gris-Nez | 14 October | Cap Gris-Nez | 14 October | |||||
| 2018 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November | |||||
| 2012 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 11 March | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 26 December | |||||
| 2009 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 7 November | |||||
| 2008 | Cap Gris-Nez | 8 October | Cap Gris-Nez | 8 October | |||||
| 2007 | Cap Gris-Nez | 27 October | Cap Gris-Nez | 27 October | |||||
| 2005 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 19 November |
