The comma butterfly, so named because the underside of the hind wing has a white comma-shaped mark, which is usually barely discernible. The ragged outline of its wings is the best recognition feature.

This is one of the few butterfly species to be thriving and spreading, perhaps because the food plant of its caterpillar is the ubiquitous stinging nettle. The adults are flitting around in July and August.  It overwinters by hibernating in hedges and bushes.