Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2021 | Breskens | 23 May | Breskens | 4 October | |||||
| 2020 | Breskens | 11 April | Breskens | 30 May | |||||
| 2019 | Breskens | 22 April | Breskens | 22 April | |||||
| 2018 | Breskens | 6 October | Breskens | 6 October | |||||
| 2017 | Breskens | 17 May | Breskens | 17 May | |||||
| 2011 | Breskens | 3 June | Breskens | 3 June | |||||
| 2009 | Breskens | 13 March | Breskens | 1 November | |||||
| 2008 | Breskens | 31 March | Breskens | 23 May | |||||
| 2007 | Breskens | 1 April | Breskens | 28 April | |||||
| 2006 | Breskens | 4 May | Breskens | 4 May | |||||
| 2005 | Breskens | 17 January | Breskens | 5 November | |||||
| 2004 | Breskens | 2 January | Breskens | 20 May | |||||
| 2003 | Breskens | 24 April | Breskens | 19 May | |||||
| 2001 | Breskens | 10 May | Breskens | 25 May |
