Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 12 October | |||||
| 2012 | Cap Gris-Nez | 19 September | Cap Gris-Nez | 19 September | |||||
| 2008 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 2 October | |||||
| 2005 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 16 April |
