Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 30 July | Cap Gris-Nez | 30 July | |||||
| 2021 | Cap Gris-Nez | 13 November | Cap Gris-Nez | 13 November | |||||
| 2020 | Cap Gris-Nez | 27 September | Cap Gris-Nez | 27 September | |||||
| 2010 | Cap Gris-Nez | 4 November | Cap Gris-Nez | 4 November | |||||
| 2009 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October |
