Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 10 August | Cap Gris-Nez | 10 August | |||||
| 2015 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 8 May | |||||
| 2012 | Cap Gris-Nez | 29 September | Cap Gris-Nez | 29 September | |||||
| 2011 | Cap Gris-Nez | 19 September | Cap Gris-Nez | 19 September | |||||
| 2010 | Cap Gris-Nez | 14 May | Cap Gris-Nez | 16 July | |||||
| 2009 | Cap Gris-Nez | 8 July | Cap Gris-Nez | 8 July | |||||
| 2008 | Cap Gris-Nez | 29 June | Cap Gris-Nez | 29 June | |||||
| 2007 | Cap Gris-Nez | 24 July | Cap Gris-Nez | 24 July | |||||
| 2005 | Cap Gris-Nez | 11 August | Cap Gris-Nez | 11 August | |||||
| 1977 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 2 October |
