The comma (Polygonia c-album) has ragged scalloped wing edges and cryptic colouring to look like leaves during hibernation. The brown and white caterpillars resemble bird droppings. Wing undersides are brown with a white mark shaped like a comma.
By the middle of the 1800s the species had suffered a severe decline that left it confined to the Welsh border counties. It is now widespread in southern Britain and its range is expanding northwards. The most widely used foodplants are common nettles, hops, elms and willows.
These butterflies were chasing each other around the clearing at the weekend.