Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 29 April | |||||
| 2018 | Cap Gris-Nez | 6 May | Cap Gris-Nez | 21 November | |||||
| 2017 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 27 March | |||||
| 2015 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 4 April | |||||
| 2014 | Cap Gris-Nez | 21 April | Cap Gris-Nez | 21 April | |||||
| 2013 | Cap Gris-Nez | 23 November | Cap Gris-Nez | 23 November | |||||
| 2012 | Cap Gris-Nez | 28 November | Cap Gris-Nez | 28 November | |||||
| 2010 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 12 May | |||||
| 2009 | Cap Gris-Nez | 24 May | Cap Gris-Nez | 24 May | |||||
| 2008 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 16 November | |||||
| 2007 | Cap Gris-Nez | 26 April | Cap Gris-Nez | 17 November | |||||
| 2006 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 28 April | |||||
| 2005 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 11 December |
