Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 19 March | |||||
| 2022 | Cap Gris-Nez | 16 March | Cap Gris-Nez | 23 August | |||||
| 2021 | Cap Gris-Nez | 1 March | Cap Gris-Nez | 30 September | |||||
| 2020 | Cap Gris-Nez | 8 August | Cap Gris-Nez | 8 August | |||||
| 2019 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 21 April | |||||
| 2018 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 16 August | |||||
| 2017 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 25 March | |||||
| 2016 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 17 March | |||||
| 2015 | Cap Gris-Nez | 7 March | Cap Gris-Nez | 15 August | |||||
| 2014 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 15 April | |||||
| 2013 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 25 May | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 24 March | |||||
| 2011 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 14 April | |||||
| 2010 | Cap Gris-Nez | 15 April | Cap Gris-Nez | 5 August | |||||
| 2009 | Cap Gris-Nez | 19 March | Cap Gris-Nez | 29 March | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 21 August | |||||
| 2007 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 31 August | |||||
| 2006 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 13 August | |||||
| 2005 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 15 April |
