Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2013 |  |
VRS Castricum | 19 January | |
VRS Castricum | 26 January | |||
| 2012 | |
VRS Castricum | 10 February | |
VRS Castricum | 11 February | |||
| 2010 | |
VRS Castricum | 22 December | |
VRS Castricum | 22 December |
