Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 17 November | Cap Gris-Nez | 21 November | |||||
| 2018 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 9 November | |||||
| 2016 | Cap Gris-Nez | 20 October | Cap Gris-Nez | 22 October | |||||
| 2015 | Cap Gris-Nez | 5 April | Cap Gris-Nez | 5 April | |||||
| 2014 | Cap Gris-Nez | 4 March | Cap Gris-Nez | 4 March | |||||
| 2011 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 26 March | |||||
| 2008 | Cap Gris-Nez | 3 October | Cap Gris-Nez | 3 October |
