Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 30 September | |||||
| 2015 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 14 March | |||||
| 2013 | Cap Gris-Nez | 31 October | Cap Gris-Nez | 11 November | |||||
| 2012 | Cap Gris-Nez | 9 November | Cap Gris-Nez | 9 November | |||||
| 2010 | Cap Gris-Nez | 8 November | Cap Gris-Nez | 8 November | |||||
| 2008 | Cap Gris-Nez | 18 October | Cap Gris-Nez | 27 October | |||||
| 2007 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 21 October | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 9 October |
