Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 23 February | Cap Gris-Nez | 4 March | |||||
| 2022 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 24 July | |||||
| 2021 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 29 September | |||||
| 2020 | Cap Gris-Nez | 30 June | Cap Gris-Nez | 1 August | |||||
| 2019 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 17 August | |||||
| 2018 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 11 September | |||||
| 2017 | Cap Gris-Nez | 23 March | Cap Gris-Nez | 26 March | |||||
| 2016 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 28 August | |||||
| 2015 | Cap Gris-Nez | 26 July | Cap Gris-Nez | 26 July | |||||
| 2014 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 17 March | |||||
| 2013 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 18 September | |||||
| 2011 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 16 September | |||||
| 2010 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 13 March | |||||
| 2008 | Cap Gris-Nez | 3 April | Cap Gris-Nez | 15 April | |||||
| 2007 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 1 April | |||||
| 2005 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 15 April |
