Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 23 November | |||||
| 2020 | Cap Gris-Nez | 15 August | Cap Gris-Nez | 4 November | |||||
| 2019 | Cap Gris-Nez | 23 February | Cap Gris-Nez | 1 November | |||||
| 2018 | Cap Gris-Nez | 7 October | Cap Gris-Nez | 4 December | |||||
| 2017 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 9 April | |||||
| 2016 | Cap Gris-Nez | 17 September | Cap Gris-Nez | 17 September | |||||
| 1958 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 5 September | |||||
| 1956 | Cap Gris-Nez | 6 October | Cap Gris-Nez | 6 October |
