Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 11 October | |||||
| 2016 | Cap Gris-Nez | 22 October | Cap Gris-Nez | 22 October | |||||
| 2014 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 11 October | |||||
| 2012 | Cap Gris-Nez | 6 November | Cap Gris-Nez | 6 November | |||||
| 2011 | Cap Gris-Nez | 24 August | Cap Gris-Nez | 24 August | |||||
| 2007 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 2 January | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 2 January | |||||
| 2005 | Cap Gris-Nez | 29 October | Cap Gris-Nez | 30 October |
