Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2019 | Parnassia, Kennemerduinen | 21 april | Parnassia, Kennemerduinen | 21 april | |||||
| 2017 | Parnassia, Kennemerduinen | 6 may | Parnassia, Kennemerduinen | 6 may | |||||
| 2014 | Parnassia, Kennemerduinen | 30 march | Parnassia, Kennemerduinen | 3 april | |||||
| 2011 | Parnassia, Kennemerduinen | 19 april | Parnassia, Kennemerduinen | 19 april |
