Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 1 May | |||||
| 2021 | Cap Gris-Nez | 30 March | Cap Gris-Nez | 26 October | |||||
| 2019 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 20 March | |||||
| 2018 | Cap Gris-Nez | 12 March | Cap Gris-Nez | 17 November | |||||
| 2017 | Cap Gris-Nez | 14 March | Cap Gris-Nez | 29 April | |||||
| 2016 | Cap Gris-Nez | 20 October | Cap Gris-Nez | 20 October | |||||
| 2015 | Cap Gris-Nez | 8 November | Cap Gris-Nez | 8 November | |||||
| 2014 | Cap Gris-Nez | 31 March | Cap Gris-Nez | 31 March | |||||
| 2013 | Cap Gris-Nez | 6 April | Cap Gris-Nez | 6 April | |||||
| 2012 | Cap Gris-Nez | 24 March | Cap Gris-Nez | 2 May | |||||
| 2008 | Cap Gris-Nez | 6 May | Cap Gris-Nez | 6 May | |||||
| 2007 | Cap Gris-Nez | 21 October | Cap Gris-Nez | 6 November | |||||
| 2006 | Cap Gris-Nez | 26 March | Cap Gris-Nez | 26 March | |||||
| 2005 | Cap Gris-Nez | 16 October | Cap Gris-Nez | 11 December |
