Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 25 September | Cap Gris-Nez | 25 September | |||||
| 2020 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October | |||||
| 2018 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 15 April | |||||
| 2016 | Cap Gris-Nez | 27 September | Cap Gris-Nez | 27 September | |||||
| 2011 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 25 September | |||||
| 2009 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 11 April | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 15 March | |||||
| 2007 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 23 September | |||||
| 2006 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 17 April | |||||
| 2005 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 16 October |
