Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 5 November | Cap Gris-Nez | 28 November | |||||
| 2019 | Cap Gris-Nez | 30 October | Cap Gris-Nez | 1 November | |||||
| 2017 | Cap Gris-Nez | 26 November | Cap Gris-Nez | 26 November | |||||
| 2016 | Cap Gris-Nez | 2 November | Cap Gris-Nez | 7 November | |||||
| 2015 | Cap Gris-Nez | 21 November | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 6 November | Cap Gris-Nez | 7 November | |||||
| 2013 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 10 October | |||||
| 2010 | Cap Gris-Nez | 7 November | Cap Gris-Nez | 7 November | |||||
| 2009 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 17 October | |||||
| 2007 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 24 November | |||||
| 2006 | Cap Gris-Nez | 24 October | Cap Gris-Nez | 12 November | |||||
| 2005 | Cap Gris-Nez | 23 October | Cap Gris-Nez | 25 November | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October |
