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BiologyThe high brown fritillary appears in late June and is on the wing until early August. Whilst active it covers a lot of ground unlike many other species of butterfly, which tend to confine themselves to areas of no more than a hectare. The butterfly feeds from the nectar of bramble and marsh thistle and is a rapid flyer between favoured feeding grounds. Females seek out warm slopes on which to lay their eggs. The egg overwinters and the caterpillar hatches in April or May to feed on violet leaves. They also need warm, sunny spots in which to develop prior to pupating in the leaf litter around the roots of bushes and scrub.