Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 15 February | Cap Gris-Nez | 14 May | |||||
| 2021 | Cap Gris-Nez | 8 March | Cap Gris-Nez | 29 May | |||||
| 2020 | Cap Gris-Nez | 21 May | Cap Gris-Nez | 10 October | |||||
| 2019 | Cap Gris-Nez | 29 March | Cap Gris-Nez | 31 March | |||||
| 2018 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 22 April | |||||
| 2017 | Cap Gris-Nez | 28 March | Cap Gris-Nez | 6 October | |||||
| 2016 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 29 July | |||||
| 2015 | Cap Gris-Nez | 7 March | Cap Gris-Nez | 8 May | |||||
| 2014 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 15 May | |||||
| 2013 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 5 October | |||||
| 2012 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 30 April | |||||
| 2011 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 22 May | |||||
| 2010 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 16 May | |||||
| 2009 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 7 November | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 24 May | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 18 October | |||||
| 2006 | Cap Gris-Nez | 7 March | Cap Gris-Nez | 3 October | |||||
| 2005 | Cap Gris-Nez | 9 March | Cap Gris-Nez | 14 November | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 10 May |
