The Common Castor (Ariadne merione) is an orange butterfly with brown lines whose larvae feed almost exclusively on Castor Ricinus communis. It is similar in appearance to Ariadne ariadne, the Angled Castor. This species is found in south-eastern Asia. Their wingspan ranges between 30–35 mm. 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.