Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 16 September | Cap Gris-Nez | 22 September | |||||
| 2020 | Cap Gris-Nez | 7 September | Cap Gris-Nez | 8 October | |||||
| 2017 | Cap Gris-Nez | 3 September | Cap Gris-Nez | 3 September | |||||
| 2016 | Cap Gris-Nez | 8 September | Cap Gris-Nez | 27 September | |||||
| 2015 | Cap Gris-Nez | 18 March | Cap Gris-Nez | 9 September | |||||
| 2014 | Cap Gris-Nez | 10 November | Cap Gris-Nez | 10 November | |||||
| 2013 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 19 August | |||||
| 2012 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 18 September | |||||
| 2011 | Cap Gris-Nez | 24 August | Cap Gris-Nez | 28 August | |||||
| 2008 | Cap Gris-Nez | 18 March | Cap Gris-Nez | 31 August | |||||
| 2007 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 27 October | |||||
| 2006 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 20 August | |||||
| 2005 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 15 September |
