Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Cap Gris-Nez | 21 May | Cap Gris-Nez | 21 May | |||||
| 2018 | Cap Gris-Nez | 16 September | Cap Gris-Nez | 16 September | |||||
| 2017 | Cap Gris-Nez | 15 September | Cap Gris-Nez | 15 September | |||||
| 2015 | Cap Gris-Nez | 21 April | Cap Gris-Nez | 21 April | |||||
| 2014 | Cap Gris-Nez | 13 May | Cap Gris-Nez | 13 May | |||||
| 2010 | Cap Gris-Nez | 14 May | Cap Gris-Nez | 14 May | |||||
| 2005 | Cap Gris-Nez | 6 May | Cap Gris-Nez | 9 October | |||||
| 1960 | Cap Gris-Nez | 10 September | Cap Gris-Nez | 10 September | |||||
| 1958 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 5 September |
