Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 28 October | |||||
| 2019 | Cap Gris-Nez | 22 October | Cap Gris-Nez | 22 October | |||||
| 2018 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 15 April | |||||
| 2017 | Cap Gris-Nez | 9 September | Cap Gris-Nez | 1 November | |||||
| 2015 | Cap Gris-Nez | 4 October | Cap Gris-Nez | 1 November | |||||
| 2014 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 6 November | |||||
| 2013 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 15 April | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 6 November | |||||
| 2011 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October | |||||
| 2010 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 2009 | Cap Gris-Nez | 13 April | Cap Gris-Nez | 13 April | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 10 November | |||||
| 2006 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 9 April | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 19 November | |||||
| 2003 | Cap Gris-Nez | 10 November | Cap Gris-Nez | 10 November | |||||
| 1959 | Cap Gris-Nez | 20 September | Cap Gris-Nez | 28 September |
