Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 26 October | |||||
| 2020 | Cap Gris-Nez | 10 September | Cap Gris-Nez | 10 October | |||||
| 2018 | Cap Gris-Nez | 27 August | Cap Gris-Nez | 7 October | |||||
| 2017 | Cap Gris-Nez | 15 September | Cap Gris-Nez | 16 October | |||||
| 2016 | Cap Gris-Nez | 8 September | Cap Gris-Nez | 27 September | |||||
| 2015 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 20 September | |||||
| 2014 | Cap Gris-Nez | 21 September | Cap Gris-Nez | 22 October | |||||
| 2013 | Cap Gris-Nez | 4 September | Cap Gris-Nez | 14 November | |||||
| 2012 | Cap Gris-Nez | 14 September | Cap Gris-Nez | 23 September | |||||
| 2011 | Cap Gris-Nez | 6 April | Cap Gris-Nez | 8 October | |||||
| 2010 | Cap Gris-Nez | 29 August | Cap Gris-Nez | 25 October | |||||
| 2009 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 9 October | |||||
| 2008 | Cap Gris-Nez | 7 May | Cap Gris-Nez | 20 September | |||||
| 2007 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 13 October | |||||
| 2006 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 25 October | |||||
| 1962 | Cap Gris-Nez | 26 September | Cap Gris-Nez | 2 October | |||||
| 1961 | Cap Gris-Nez | 29 August | Cap Gris-Nez | 29 August |
