Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2016 | De Horde (Lopik) | 10 october | De Horde (Lopik) | 10 october | |||||
| 2012 | De Horde (Lopik) | 15 september | De Horde (Lopik) | 30 september | |||||
| 2008 | De Horde (Lopik) | 31 october | De Horde (Lopik) | 31 october | |||||
| 2007 | De Horde (Lopik) | 8 september | De Horde (Lopik) | 8 september | |||||
| 2002 | De Horde (Lopik) | 19 october | De Horde (Lopik) | 19 october |
