Sanguisorba officinalis
The larva of this species first feeds on "Sanguisorba officinalis" (great burnet), then moves onto ant nests and is a predator of the ant brood. "Myrmica rubra" and "Myrmica scabrinodis" have been reported as frequent host ant species. A recent microhabitat preference study indicates that grazing is necessary for maintaining the present distribution and abundance of these butterflies.