Samia cynthia ricini, commonly known as the Eri silk moth, is a species of moth belonging to the family Saturniidae. Native to parts of Asia, particularly India and China, this moth is known for its role in silk production. The larvae feed primarily on the leaves of the castor oil plant and other related species, which contributes to the unique properties of the silk they produce. The adult moth has a wingspan of about 8 to 10 centimeters and is characterized by its soft, light brown wings with distinct markings. Unlike other silk-producing moths, Samia cynthia ricini is not typically used for commercial silk production due to its lower silk yield, but it is valued for its ecological role and potential in sustainable practices.