Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 23 October | |||||
| 2018 | Cap Gris-Nez | 14 November | Cap Gris-Nez | 14 November | |||||
| 2013 | Cap Gris-Nez | 21 November | Cap Gris-Nez | 21 November | |||||
| 2012 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 30 September | |||||
| 2011 | Cap Gris-Nez | 24 July | Cap Gris-Nez | 24 July | |||||
| 2009 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 11 April | |||||
| 2008 | Cap Gris-Nez | 19 July | Cap Gris-Nez | 21 August | |||||
| 2005 | Cap Gris-Nez | 6 November | Cap Gris-Nez | 6 November |
