Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 11 May | |||||
| 2018 | Cap Gris-Nez | 9 September | Cap Gris-Nez | 10 September | |||||
| 2017 | Cap Gris-Nez | 3 September | Cap Gris-Nez | 7 September | |||||
| 2015 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 9 March | |||||
| 2014 | Cap Gris-Nez | 15 May | Cap Gris-Nez | 25 September | |||||
| 2012 | Cap Gris-Nez | 14 September | Cap Gris-Nez | 14 September | |||||
| 2011 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 3 October | |||||
| 2010 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 29 July | |||||
| 2009 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 2 August | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 8 May | |||||
| 2007 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 16 August | |||||
| 2006 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 15 August | |||||
| 2005 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 27 October |
