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The Clouded Apollo occurs in rocky regions on damp to moderately dry grasslands and sparse deciduous woodland, forest clearings and edges in the neighborhood of large stands of the larval foodplants of the genus Corydalis. The butterflies can often be seen nectaring on red or purple flowers. Larvae are usually found feeding on foodplants that occur on sunny margins or clearings in the forests. The egg hibernates. In spring, as soon as it has hatched, the small caterpillar starts its search for a suitable foodplant. When fully-grown, it pupates in a closely spun cocoon of fine threads, situated above the ground in the leaves of the foodplant or litter. The Clouded Apollo has one generation a year. Habitats: broad-leaved deciduous forests (22%), alpine and subalpine grasslands (19%), mesophile grasslands (14%), humid grasslands and tall herb communities (10%), mixed woodland (8%), dry calcareous grasslands and steppes (8%).