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

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