Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | De Horde (Lopik) | 12 December | De Horde (Lopik) | 12 December | |||||
| 2016 | De Horde (Lopik) | 16 February | De Horde (Lopik) | 16 February | |||||
| 2014 | De Horde (Lopik) | 28 December | De Horde (Lopik) | 28 December | |||||
| 2013 | De Horde (Lopik) | 14 January | De Horde (Lopik) | 15 January | |||||
| 2010 | De Horde (Lopik) | 24 January | De Horde (Lopik) | 18 December | |||||
| 2008 | De Horde (Lopik) | 17 November | De Horde (Lopik) | 17 November |
