Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 27 October | |||||
| 2020 | Cap Gris-Nez | 12 May | Cap Gris-Nez | 8 October | |||||
| 2019 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 25 October | |||||
| 2018 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 27 November | |||||
| 2017 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 7 October | |||||
| 2016 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 15 October | |||||
| 2015 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 3 October | |||||
| 2014 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 10 November | |||||
| 2013 | Cap Gris-Nez | 13 April | Cap Gris-Nez | 11 October | |||||
| 2012 | Cap Gris-Nez | 6 April | Cap Gris-Nez | 14 October | |||||
| 2011 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 16 October | |||||
| 2010 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 3 October | |||||
| 2009 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 3 October | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 21 October | |||||
| 2006 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 9 October | |||||
| 2005 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 14 November | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 5 October | |||||
| 2003 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 31 July | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 20 October | |||||
| 1978 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 2 October | |||||
| 1956 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 6 October |
