Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 21 November | Cap Gris-Nez | 1 December | |||||
| 2020 | Cap Gris-Nez | 28 July | Cap Gris-Nez | 9 October | |||||
| 2016 | Cap Gris-Nez | 8 August | Cap Gris-Nez | 31 August | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 2 January | |||||
| 2008 | Cap Gris-Nez | 6 January | Cap Gris-Nez | 6 January | |||||
| 2007 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 2 January | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 2 January |
