Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 | Parnassia, Kennemerduinen | 12 April | Parnassia, Kennemerduinen | 12 April | |||||
| 2021 | Parnassia, Kennemerduinen | 28 April | Parnassia, Kennemerduinen | 9 May | |||||
| 2011 | Parnassia, Kennemerduinen | 23 April | Parnassia, Kennemerduinen | 23 April | |||||
| 2008 | Parnassia, Kennemerduinen | 22 April | Parnassia, Kennemerduinen | 22 April | |||||
| 1988 | Parnassia, Kennemerduinen | 12 April | Parnassia, Kennemerduinen | 12 April | |||||
| 1983 | Parnassia, Kennemerduinen | 29 September | Parnassia, Kennemerduinen | 29 September |
