Eri threads are extracted from Eri worm , like any other silk extraction. The scientific name of the Eri worm is Samia Ricini. This worm is not wild as Muga, completes the whole life cycle at home only.The name 'Eri' has evolved from 'Era' plant (Cator Plant) which is called 'Eranda' in Sanskrit. This plant is main food source for the Eri worm and normally found in these plants only.