Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 25 September | |||||
| 2014 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 11 October | |||||
| 2008 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 28 October | |||||
| 2005 | Cap Gris-Nez | 13 November | Cap Gris-Nez | 13 November |
