A kind of snake. Kashyapa’s wife Krodhavasha had 10 daughters – Mrigi, Mrigamanda, Hari, Bhadramada, Matangi, Sharduli, Shweta, Surabhi, Surasa, Kadru. From Surasa was born nagas and from Kadru Uragas as per Ramayana Aranyakanda Sarga 14.