Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2023 | Cap Gris-Nez | 3 February | Cap Gris-Nez | 3 February | |||||
| 2022 | Cap Gris-Nez | 20 March | Cap Gris-Nez | 20 March | |||||
| 2021 | Cap Gris-Nez | 28 October | Cap Gris-Nez | 28 October | |||||
| 2020 | Cap Gris-Nez | 10 October | Cap Gris-Nez | 10 October | |||||
| 2018 | Cap Gris-Nez | 29 October | Cap Gris-Nez | 29 October | |||||
| 2017 | Cap Gris-Nez | 10 April | Cap Gris-Nez | 3 October | |||||
| 2016 | Cap Gris-Nez | 2 November | Cap Gris-Nez | 2 November | |||||
| 2014 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 9 December | |||||
| 2013 | Cap Gris-Nez | 29 June | Cap Gris-Nez | 24 November | |||||
| 2012 | Cap Gris-Nez | 16 April | Cap Gris-Nez | 28 October | |||||
| 2011 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 20 October | |||||
| 2007 | Cap Gris-Nez | 10 March | Cap Gris-Nez | 30 July | |||||
| 2006 | Cap Gris-Nez | 9 April | Cap Gris-Nez | 3 October | |||||
| 2005 | Cap Gris-Nez | 24 April | Cap Gris-Nez | 18 October | |||||
| 2003 | Cap Gris-Nez | 25 October | Cap Gris-Nez | 25 October | |||||
| 1987 | Cap Gris-Nez | 19 October | Cap Gris-Nez | 19 October | |||||
| 1963 | Cap Gris-Nez | 23 September | Cap Gris-Nez | 23 September |
