Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 25 April | Cap Gris-Nez | 7 August | |||||
| 2020 | Cap Gris-Nez | 23 May | Cap Gris-Nez | 22 August | |||||
| 2019 | Cap Gris-Nez | 12 May | Cap Gris-Nez | 17 August | |||||
| 2018 | Cap Gris-Nez | 27 April | Cap Gris-Nez | 21 May | |||||
| 2017 | Cap Gris-Nez | 4 May | Cap Gris-Nez | 6 August | |||||
| 2016 | Cap Gris-Nez | 22 April | Cap Gris-Nez | 23 July | |||||
| 2015 | Cap Gris-Nez | 4 May | Cap Gris-Nez | 23 August | |||||
| 2014 | Cap Gris-Nez | 6 May | Cap Gris-Nez | 22 July | |||||
| 2013 | Cap Gris-Nez | 30 April | Cap Gris-Nez | 3 August | |||||
| 2012 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 30 August | |||||
| 2011 | Cap Gris-Nez | 22 May | Cap Gris-Nez | 9 September | |||||
| 2010 | Cap Gris-Nez | 22 April | Cap Gris-Nez | 19 July | |||||
| 2009 | Cap Gris-Nez | 3 May | Cap Gris-Nez | 1 November | |||||
| 2008 | Cap Gris-Nez | 6 May | Cap Gris-Nez | 17 August | |||||
| 2007 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 17 August | |||||
| 2006 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 29 August | |||||
| 2005 | Cap Gris-Nez | 23 April | Cap Gris-Nez | 7 September | |||||
| 2004 | Cap Gris-Nez | 5 October | Cap Gris-Nez | 5 October | |||||
| 2003 | Cap Gris-Nez | 19 May | Cap Gris-Nez | 19 May |
