Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 26 September | |||||
| 2016 | Cap Gris-Nez | 9 January | Cap Gris-Nez | 9 January | |||||
| 2014 | Cap Gris-Nez | 22 November | Cap Gris-Nez | 22 November | |||||
| 2013 | Cap Gris-Nez | 16 February | Cap Gris-Nez | 16 February | |||||
| 2012 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 19 February | |||||
| 2010 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 24 January | |||||
| 2009 | Cap Gris-Nez | 8 February | Cap Gris-Nez | 7 March | |||||
| 2008 | Cap Gris-Nez | 24 February | Cap Gris-Nez | 14 December | |||||
| 2007 | Cap Gris-Nez | 4 March | Cap Gris-Nez | 4 March | |||||
| 2006 | Cap Gris-Nez | 2 January | Cap Gris-Nez | 1 July | |||||
| 2005 | Cap Gris-Nez | 23 April | Cap Gris-Nez | 29 November | |||||
| 2003 | Cap Gris-Nez | 31 July | Cap Gris-Nez | 25 October | |||||
| 2002 | Cap Gris-Nez | 21 August | Cap Gris-Nez | 22 August | |||||
| 1987 | Cap Gris-Nez | 17 October | Cap Gris-Nez | 23 October | |||||
| 1986 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 24 October | |||||
| 1982 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 10 April | |||||
| 1978 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 1 October | |||||
| 1977 | Cap Gris-Nez | 19 November | Cap Gris-Nez | 19 November | |||||
| 1956 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October |
