Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 21 July | |||||
| 2021 | Cap Gris-Nez | 11 July | Cap Gris-Nez | 11 July | |||||
| 2019 | Cap Gris-Nez | 10 July | Cap Gris-Nez | 10 July | |||||
| 2018 | Cap Gris-Nez | 21 September | Cap Gris-Nez | 21 September |
