The Small Heath (Coenonympha pamphilus) looks similar to the Meadow Brown (Maniola jurtina) and the Gatekeeper (Pyronia tithonus), but is distinguished by its much smaller size and the hairy backs of the wings.

1st & 2nd photo: Viroin Hermeton Nature Park, Namur, Belgium 12 August 2024
3rd photo: Nature Reserve Hoge Venen, Liège, Belgium, 7 August 2022