Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Cap Gris-Nez | 2 April | Cap Gris-Nez | 8 May | |||||
| 2021 | Cap Gris-Nez | 18 April | Cap Gris-Nez | 23 October | |||||
| 2020 | Cap Gris-Nez | 15 May | Cap Gris-Nez | 4 November | |||||
| 2019 | Cap Gris-Nez | 5 March | Cap Gris-Nez | 5 September | |||||
| 2018 | Cap Gris-Nez | 28 April | Cap Gris-Nez | 29 October | |||||
| 2017 | Cap Gris-Nez | 8 May | Cap Gris-Nez | 8 May | |||||
| 2016 | Cap Gris-Nez | 8 September | Cap Gris-Nez | 17 September | |||||
| 2015 | Cap Gris-Nez | 1 May | Cap Gris-Nez | 25 September | |||||
| 2014 | Cap Gris-Nez | 15 August | Cap Gris-Nez | 15 August | |||||
| 2011 | Cap Gris-Nez | 11 September | Cap Gris-Nez | 26 September | |||||
| 2009 | Cap Gris-Nez | 5 September | Cap Gris-Nez | 2 October | |||||
| 2008 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 28 October | |||||
| 2007 | Cap Gris-Nez | 5 May | Cap Gris-Nez | 19 September | |||||
| 2005 | Cap Gris-Nez | 21 July | Cap Gris-Nez | 31 August |
