Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Cap Gris-Nez | 21 May | Cap Gris-Nez | 30 December | |||||
| 2014 | Cap Gris-Nez | 6 November | Cap Gris-Nez | 6 November | |||||
| 2012 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 9 March | |||||
| 2010 | Cap Gris-Nez | 26 December | Cap Gris-Nez | 26 December | |||||
| 2006 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 19 March |
