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 |
