Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 5 May | |||||
| 2022 | Cap Gris-Nez | 25 February | Cap Gris-Nez | 25 February | |||||
| 2021 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 24 October | |||||
| 2020 | Cap Gris-Nez | 17 March | Cap Gris-Nez | 17 March | |||||
| 2016 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 23 August | |||||
| 2015 | Cap Gris-Nez | 16 March | Cap Gris-Nez | 25 March | |||||
| 2014 | Cap Gris-Nez | 26 February | Cap Gris-Nez | 19 May | |||||
| 2013 | Cap Gris-Nez | 7 April | Cap Gris-Nez | 12 May | |||||
| 2012 | Cap Gris-Nez | 11 March | Cap Gris-Nez | 11 March | |||||
| 2011 | Cap Gris-Nez | 27 February | Cap Gris-Nez | 24 September | |||||
| 2010 | Cap Gris-Nez | 13 March | Cap Gris-Nez | 22 June | |||||
| 2009 | Cap Gris-Nez | 22 February | Cap Gris-Nez | 11 April | |||||
| 2008 | Cap Gris-Nez | 27 January | Cap Gris-Nez | 26 April | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 8 July | |||||
| 2006 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 13 May | |||||
| 2005 | Cap Gris-Nez | 6 March | Cap Gris-Nez | 29 October |
