Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2017 | Cap Gris-Nez | 7 June | Cap Gris-Nez | 17 November | |||||
| 2010 | Cap Gris-Nez | 26 September | Cap Gris-Nez | 26 September | |||||
| 2008 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October | |||||
| 2007 | Cap Gris-Nez | 30 June | Cap Gris-Nez | 9 November | |||||
| 2006 | Cap Gris-Nez | 23 May | Cap Gris-Nez | 24 October | |||||
| 1986 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 23 October | |||||
| 1978 | Cap Gris-Nez | 30 September | Cap Gris-Nez | 1 October | |||||
| 1961 | Cap Gris-Nez | 21 August | Cap Gris-Nez | 21 August |
