Ábrahám Levente – Farkas Sándor: Butterflies along the river Drava, 2008
The Drava rivershore is adjoined by riverine willow-poplar woodlands with fresh vegetation. The most typical trees of these forests are various willow and poplar species, and their undergrowth is always lush. Because of the proximity of the river, their atmosphere is fresh and humid. The most characteristic butterflies of these areas are purple emperors. They are named after the iridescent glow on the wings of male specimens. Their caterpil lars feed on various willows. Quite uniquely in entire Europe, three purple emperor species have their populations alone Drava river.
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