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Euthalia aconthea, also known as the common baron, is a medium-sized species of butterfly in the family Nymphalidae native to south and south-east Asia. In 1905, Charles Thomas Bingham recorded it to be found throughout peninsular India, except in the desert tracts, and the higher ranges of the Himalayas; Assam; Burma; Tenasserim, extending to the peninsula, and Sumatra. This E. aconthea caterpillar was photographed on Don Det, an island in the Mekong, and part of Si Phan Don, an archipelago in southern Laos.Photograph credit: Basile Morin