Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 18 September | |||||
| 2020 | Cap Gris-Nez | 12 May | Cap Gris-Nez | 27 September | |||||
| 2019 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 7 September | |||||
| 2018 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 13 November | |||||
| 2017 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 18 September | |||||
| 2016 | Cap Gris-Nez | 5 April | Cap Gris-Nez | 31 August | |||||
| 2015 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 19 September | |||||
| 2014 | Cap Gris-Nez | 13 April | Cap Gris-Nez | 27 November | |||||
| 2013 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 10 October | |||||
| 2012 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 12 September | |||||
| 2011 | Cap Gris-Nez | 5 April | Cap Gris-Nez | 9 October | |||||
| 2010 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 19 September | |||||
| 2009 | Cap Gris-Nez | 18 April | Cap Gris-Nez | 1 October | |||||
| 2008 | Cap Gris-Nez | 5 April | Cap Gris-Nez | 13 September | |||||
| 2007 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 23 September | |||||
| 2006 | Cap Gris-Nez | 12 April | Cap Gris-Nez | 1 November | |||||
| 2005 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 12 October | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 16 May | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 22 August | |||||
| 1986 | Cap Gris-Nez | 22 October | Cap Gris-Nez | 22 October | |||||
| 1978 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 30 March | |||||
| 1958 | Cap Gris-Nez | 4 September | Cap Gris-Nez | 5 September |
