Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 19 March | |||||
| 2021 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 23 November | |||||
| 2020 | Cap Gris-Nez | 22 December | Cap Gris-Nez | 22 December | |||||
| 2005 | Cap Gris-Nez | 11 December | Cap Gris-Nez | 11 December |
