The Common Castor (Ariadne merione) is an orange butterfly with brown lines whose larvae feed almost exclusively on Castor Ricinus communis.

This species is found in south-eastern Asia. Their wingspan ranges between 30–35mm. Like others in the Nymphalidae family, their front two legs are small and unused, effectively making them four-legged. These smaller appendages are covered with long hairs, giving them the characteristic brush look.