Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 4 April | |||||
| 2016 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 31 August | |||||
| 2015 | Cap Gris-Nez | 27 April | Cap Gris-Nez | 27 April | |||||
| 2014 | Cap Gris-Nez | 15 May | Cap Gris-Nez | 15 May | |||||
| 2013 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 8 May | |||||
| 2008 | Cap Gris-Nez | 22 April | Cap Gris-Nez | 22 April | |||||
| 2006 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 14 May | |||||
| 2005 | Cap Gris-Nez | 2 May | Cap Gris-Nez | 30 July |
