Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2006 |  |
VRS Castricum | 3 May | |
VRS Castricum | 3 May | |||
| 1990 | |
VRS Castricum | 11 August | |
VRS Castricum | 11 August | |||
| 1988 | |
VRS Castricum | 2 October | |
VRS Castricum | 2 October | |||
| 1987 | |
VRS Castricum | 18 August | |
VRS Castricum | 18 August | |||
| 1986 | |
VRS Castricum | 5 June | |
VRS Castricum | 5 June | |||
| 1984 | |
VRS Castricum | 24 September | |
VRS Castricum | 24 September | |||
| 1981 | |
VRS Castricum | 5 September | |
VRS Castricum | 5 September | |||
| 1980 | |
VRS Castricum | 10 August | |
VRS Castricum | 10 August | |||
| 1979 | |
VRS Castricum | 15 September | |
VRS Castricum | 15 September |
