Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 10 July | Cap Gris-Nez | 18 December | |||||
| 2021 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 26 December | |||||
| 2019 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 27 December | |||||
| 2018 | Cap Gris-Nez | 18 February | Cap Gris-Nez | 18 November | |||||
| 2017 | Cap Gris-Nez | 14 November | Cap Gris-Nez | 14 November | |||||
| 2015 | Cap Gris-Nez | 22 November | Cap Gris-Nez | 22 November | |||||
| 2014 | Cap Gris-Nez | 18 July | Cap Gris-Nez | 12 November | |||||
| 2013 | Cap Gris-Nez | 11 October | Cap Gris-Nez | 21 November | |||||
| 2012 | Cap Gris-Nez | 29 November | Cap Gris-Nez | 29 November | |||||
| 2011 | Cap Gris-Nez | 27 February | Cap Gris-Nez | 12 November | |||||
| 2010 | Cap Gris-Nez | 1 November | Cap Gris-Nez | 7 November | |||||
| 2009 | Cap Gris-Nez | 10 May | Cap Gris-Nez | 8 July | |||||
| 2008 | Cap Gris-Nez | 24 February | Cap Gris-Nez | 5 July | |||||
| 2007 | Cap Gris-Nez | 30 April | Cap Gris-Nez | 4 November | |||||
| 2006 | Cap Gris-Nez | 24 June | Cap Gris-Nez | 28 July | |||||
| 2005 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 30 October | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 21 October | |||||
| 1978 | Cap Gris-Nez | 1 October | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 2 October | Cap Gris-Nez | 19 November | |||||
| 1963 | Cap Gris-Nez | 21 August | Cap Gris-Nez | 23 September | |||||
| 1962 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 5 October | |||||
| 1961 | Cap Gris-Nez | 28 August | Cap Gris-Nez | 30 September | |||||
| 1958 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 14 September |
