Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 20 March | |||||
| 2021 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 22 April | |||||
| 2018 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 20 April | |||||
| 2009 | Cap Gris-Nez | 9 August | Cap Gris-Nez | 9 August | |||||
| 2007 | Cap Gris-Nez | 17 April | Cap Gris-Nez | 17 April | |||||
| 2005 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 3 April |
