Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 24 April | Cap Gris-Nez | 24 August | |||||
| 2020 | Cap Gris-Nez | 17 May | Cap Gris-Nez | 26 September | |||||
| 2019 | Cap Gris-Nez | 23 April | Cap Gris-Nez | 14 May | |||||
| 2018 | Cap Gris-Nez | 15 August | Cap Gris-Nez | 9 September | |||||
| 2017 | Cap Gris-Nez | 23 April | Cap Gris-Nez | 20 August | |||||
| 2016 | Cap Gris-Nez | 22 April | Cap Gris-Nez | 8 September | |||||
| 2014 | Cap Gris-Nez | 21 July | Cap Gris-Nez | 29 August | |||||
| 2013 | Cap Gris-Nez | 3 May | Cap Gris-Nez | 3 August | |||||
| 2011 | Cap Gris-Nez | 25 August | Cap Gris-Nez | 16 October | |||||
| 2010 | Cap Gris-Nez | 12 August | Cap Gris-Nez | 16 August | |||||
| 2009 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 28 April | |||||
| 2008 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 16 September | |||||
| 2007 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 19 August | |||||
| 2006 | Cap Gris-Nez | 7 May | Cap Gris-Nez | 5 August | |||||
| 2005 | Cap Gris-Nez | 14 May | Cap Gris-Nez | 10 September | |||||
| 1958 | Cap Gris-Nez | 4 September | Cap Gris-Nez | 4 September |
