Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 18 May | |||||
| 2022 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 21 April | |||||
| 2021 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 11 May | |||||
| 2020 | Cap Gris-Nez | 17 May | Cap Gris-Nez | 17 May | |||||
| 2019 | Cap Gris-Nez | 4 April | Cap Gris-Nez | 4 April | |||||
| 2018 | Cap Gris-Nez | 25 March | Cap Gris-Nez | 14 May | |||||
| 2017 | Cap Gris-Nez | 14 November | Cap Gris-Nez | 14 November | |||||
| 2016 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 16 November | |||||
| 2015 | Cap Gris-Nez | 20 April | Cap Gris-Nez | 20 September | |||||
| 2014 | Cap Gris-Nez | 27 March | Cap Gris-Nez | 12 November | |||||
| 2013 | Cap Gris-Nez | 21 March | Cap Gris-Nez | 28 April | |||||
| 2012 | Cap Gris-Nez | 1 April | Cap Gris-Nez | 28 October | |||||
| 2011 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 14 April | |||||
| 2010 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 19 October | |||||
| 2009 | Cap Gris-Nez | 28 February | Cap Gris-Nez | 11 April | |||||
| 2008 | Cap Gris-Nez | 15 March | Cap Gris-Nez | 22 April | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 4 November | |||||
| 2006 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 5 November | |||||
| 2005 | Cap Gris-Nez | 4 February | Cap Gris-Nez | 17 November |
