Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 24 October | Cap Gris-Nez | 24 October | |||||
| 2020 | Cap Gris-Nez | 14 October | Cap Gris-Nez | 14 October | |||||
| 2019 | Cap Gris-Nez | 27 February | Cap Gris-Nez | 25 October | |||||
| 2015 | Cap Gris-Nez | 24 October | Cap Gris-Nez | 24 October | |||||
| 2014 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 11 October | |||||
| 2011 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October | |||||
| 2010 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 2007 | Cap Gris-Nez | 18 October | Cap Gris-Nez | 18 October | |||||
| 2005 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 30 October |
