Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 13 April | Cap Gris-Nez | 18 August | |||||
| 2020 | Cap Gris-Nez | 15 May | Cap Gris-Nez | 27 September | |||||
| 2019 | Cap Gris-Nez | 13 April | Cap Gris-Nez | 2 September | |||||
| 2018 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 1 October | |||||
| 2017 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 29 October | |||||
| 2016 | Cap Gris-Nez | 26 April | Cap Gris-Nez | 18 September | |||||
| 2015 | Cap Gris-Nez | 11 April | Cap Gris-Nez | 30 July | |||||
| 2014 | Cap Gris-Nez | 8 April | Cap Gris-Nez | 10 October | |||||
| 2013 | Cap Gris-Nez | 20 September | Cap Gris-Nez | 11 October | |||||
| 2012 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 14 October | |||||
| 2011 | Cap Gris-Nez | 20 September | Cap Gris-Nez | 10 October | |||||
| 2010 | Cap Gris-Nez | 31 July | Cap Gris-Nez | 1 November | |||||
| 2009 | Cap Gris-Nez | 2 May | Cap Gris-Nez | 11 October | |||||
| 2008 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 13 October | |||||
| 2007 | Cap Gris-Nez | 25 April | Cap Gris-Nez | 18 October | |||||
| 2006 | Cap Gris-Nez | 12 April | Cap Gris-Nez | 31 October | |||||
| 2005 | Cap Gris-Nez | 5 April | Cap Gris-Nez | 15 November | |||||
| 2004 | Cap Gris-Nez | 9 May | Cap Gris-Nez | 15 September | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 22 October | |||||
| 1986 | Cap Gris-Nez | 23 October | Cap Gris-Nez | 23 October | |||||
| 1978 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 2 October | |||||
| 1958 | Cap Gris-Nez | 4 September | Cap Gris-Nez | 4 September | |||||
| 1956 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 6 October |
