Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2020 | Parnassia, Kennemerduinen | 5 April | Parnassia, Kennemerduinen | 5 April | |||||
| 2017 | Parnassia, Kennemerduinen | 11 May | Parnassia, Kennemerduinen | 11 May | |||||
| 2015 | Parnassia, Kennemerduinen | 13 March | Parnassia, Kennemerduinen | 13 March | |||||
| 1991 | Parnassia, Kennemerduinen | 13 April | Parnassia, Kennemerduinen | 13 April | |||||
| 1982 | Parnassia, Kennemerduinen | 29 August | Parnassia, Kennemerduinen | 29 August |
