Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 17 April | |||||
| 2021 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 15 October | |||||
| 2017 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 12 November | |||||
| 2015 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 24 October | |||||
| 2012 | Cap Gris-Nez | 19 September | Cap Gris-Nez | 19 September | |||||
| 2010 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 2008 | Cap Gris-Nez | 20 September | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 21 October | |||||
| 2005 | Cap Gris-Nez | 31 August | Cap Gris-Nez | 20 November |
