A silver stripe on a nettle leaf.

They're so small that you walk past them without seeing them. Yet they are quite common at this time of year. Especially in shrubs and rough terrain with blackberry bushes and nettles. The little butterfly we're talking about is the so-called Silver Bar. A day of active night butterfly that is especially active towards the evening. Photo taken on June 23, 2021 in the waterleidingbos in Macharen (NL)