The Peacock butterfly (Aglais io) [1] can almost always be found on the Butterfly bush (Buddleja davidii) foraging for nectar.

References
1 Nederlands SoortenregisterAglais io (Peacock butterfly)
Buddleja davidii (Butterfly bush)Collection
Aglais io
Peacock butterfly
LOCATION: Krimpen aan den IJssel, garden
OBSERVATION:
2020-IX-19
The Peacock butterfly (Aglais io) [1] can almost always be found on the Butterfly bush (Buddleja davidii) foraging for nectar.
References
1 Nederlands Soortenregister