Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | De Horde (Lopik) | 26 March | De Horde (Lopik) | 26 March | |||||
| 2019 | De Horde (Lopik) | 15 April | De Horde (Lopik) | 30 June | |||||
| 2018 | De Horde (Lopik) | 7 April | De Horde (Lopik) | 29 June | |||||
| 2017 | De Horde (Lopik) | 28 March | De Horde (Lopik) | 28 March | |||||
| 2016 | De Horde (Lopik) | 1 April | De Horde (Lopik) | 20 August | |||||
| 2015 | De Horde (Lopik) | 28 March | De Horde (Lopik) | 24 October | |||||
| 2014 | De Horde (Lopik) | 9 October | De Horde (Lopik) | 9 October | |||||
| 2009 | De Horde (Lopik) | 15 October | De Horde (Lopik) | 15 October | |||||
| 2008 | De Horde (Lopik) | 18 April | De Horde (Lopik) | 18 April | |||||
| 2007 | De Horde (Lopik) | 5 November | De Horde (Lopik) | 5 November | |||||
| 2006 | De Horde (Lopik) | 8 October | De Horde (Lopik) | 8 October | |||||
| 2002 | De Horde (Lopik) | 24 July | De Horde (Lopik) | 24 July |
