Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Breskens | 17 April | Breskens | 24 April | |||||
| 2010 | Breskens | 18 April | Breskens | 25 April | |||||
| 2007 | Breskens | 25 April | Breskens | 25 April | |||||
| 2004 | Breskens | 1 May | Breskens | 1 May | |||||
| 2001 | Breskens | 27 April | Breskens | 27 April | |||||
| 2000 | Breskens | 17 April | Breskens | 17 April | |||||
| 1999 | Breskens | 25 April | Breskens | 25 April | |||||
| 1997 | Breskens | 9 April | Breskens | 9 April | |||||
| 1996 | Breskens | 21 April | Breskens | 21 April | |||||
| 1993 | Breskens | 10 April | Breskens | 11 May | |||||
| 1985 | Breskens | 18 April | Breskens | 18 April |
