Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 22 October | Cap Gris-Nez | 11 November | |||||
| 2020 | Cap Gris-Nez | 7 October | Cap Gris-Nez | 7 October | |||||
| 2014 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 2 April | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 24 March | |||||
| 2010 | Cap Gris-Nez | 26 December | Cap Gris-Nez | 26 December | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 10 March | |||||
| 2006 | Cap Gris-Nez | 7 January | Cap Gris-Nez | 7 January | |||||
| 1986 | Cap Gris-Nez | 24 October | Cap Gris-Nez | 24 October |
