Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2012 | Breskens | 4 January | Breskens | 6 January | |||||
| 2008 | Breskens | 12 January | Breskens | 2 February | |||||
| 2007 | Breskens | 15 December | Breskens | 15 December | |||||
| 2005 | Breskens | 9 March | Breskens | 18 October | |||||
| 2003 | Breskens | 25 February | Breskens | 1 March | |||||
| 1996 | Breskens | 3 March | Breskens | 1 April | |||||
| 1987 | Breskens | 14 February | Breskens | 1 May | |||||
| 1986 | Breskens | 1 April | Breskens | 30 April | |||||
| 1985 | Breskens | 8 February | Breskens | 29 April | |||||
| 1984 | Breskens | 11 February | Breskens | 25 February | |||||
| 1983 | Breskens | 8 February | Breskens | 26 February | |||||
| 1981 | Breskens | 1 May | Breskens | 11 May |
