Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | Breskens | 12 April | Breskens | 12 April | |||||
| 2013 | Breskens | 7 April | Breskens | 7 April | |||||
| 2010 | Breskens | 6 May | Breskens | 6 May | |||||
| 2005 | Breskens | 9 March | Breskens | 9 March | |||||
| 2003 | Breskens | 15 February | Breskens | 28 February | |||||
| 2000 | Breskens | 29 April | Breskens | 29 April | |||||
| 1998 | Breskens | 22 March | Breskens | 23 March | |||||
| 1996 | Breskens | 13 April | Breskens | 13 April | |||||
| 1993 | Breskens | 7 May | Breskens | 7 May | |||||
| 1992 | Breskens | 10 February | Breskens | 10 February | |||||
| 1990 | Breskens | 17 February | Breskens | 17 February | |||||
| 1989 | Breskens | 16 February | Breskens | 16 February | |||||
| 1981 | Breskens | 21 April | Breskens | 21 April |
