Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 2 May | Cap Gris-Nez | 2 October | |||||
| 2021 | Cap Gris-Nez | 13 August | Cap Gris-Nez | 22 August | |||||
| 2014 | Cap Gris-Nez | 2 August | Cap Gris-Nez | 2 August | |||||
| 2013 | Cap Gris-Nez | 19 April | Cap Gris-Nez | 27 April | |||||
| 2010 | Cap Gris-Nez | 17 May | Cap Gris-Nez | 17 May | |||||
| 2009 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 24 May | |||||
| 2008 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 20 April | |||||
| 2007 | Cap Gris-Nez | 29 April | Cap Gris-Nez | 17 July | |||||
| 2006 | Cap Gris-Nez | 12 April | Cap Gris-Nez | 5 May | |||||
| 2005 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 23 July | |||||
| 2003 | Cap Gris-Nez | 19 May | Cap Gris-Nez | 19 May |
