Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 13 August | |||||
| 2020 | Cap Gris-Nez | 8 August | Cap Gris-Nez | 8 August | |||||
| 2019 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 13 April | |||||
| 2018 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 28 October | |||||
| 2017 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 11 November | |||||
| 2015 | Cap Gris-Nez | 15 August | Cap Gris-Nez | 15 August | |||||
| 2013 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 27 August | |||||
| 2012 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 6 April | |||||
| 2011 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 26 November | |||||
| 2010 | Cap Gris-Nez | 19 April | Cap Gris-Nez | 4 November | |||||
| 2009 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 6 November | |||||
| 2008 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 15 November | |||||
| 2007 | Cap Gris-Nez | 6 April | Cap Gris-Nez | 7 November | |||||
| 2006 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 5 September | |||||
| 2005 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 9 November |
