Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 16 April | |||||
| 2021 | Cap Gris-Nez | 13 August | Cap Gris-Nez | 13 August | |||||
| 2020 | Cap Gris-Nez | 1 August | Cap Gris-Nez | 26 September | |||||
| 2018 | Cap Gris-Nez | 15 August | Cap Gris-Nez | 15 August | |||||
| 2017 | Cap Gris-Nez | 12 September | Cap Gris-Nez | 6 October | |||||
| 2016 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 21 March | |||||
| 2013 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 20 March | |||||
| 2012 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 31 March | |||||
| 2011 | Cap Gris-Nez | 11 September | Cap Gris-Nez | 11 September | |||||
| 2010 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 6 March | |||||
| 2006 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 13 August | |||||
| 2005 | Cap Gris-Nez | 12 August | Cap Gris-Nez | 12 August | |||||
| 1961 | Cap Gris-Nez | 20 August | Cap Gris-Nez | 20 August | |||||
| 1958 | Cap Gris-Nez | 9 September | Cap Gris-Nez | 10 September |
