Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2018 | De Horde (Lopik) | 22 may | De Horde (Lopik) | 22 may | |||||
| 2017 | De Horde (Lopik) | 3 september | De Horde (Lopik) | 3 september | |||||
| 2016 | De Horde (Lopik) | 8 may | De Horde (Lopik) | 9 may | |||||
| 2000 | De Horde (Lopik) | 16 may | De Horde (Lopik) | 16 may |
