A म्लेच्छ --low caste. The महाभारत has the following about शबरस् .

शबरस् were born from the dung and urine of नन्दिनी , the cow of वसिष्ठ . [mh-1-174-16 ] Mahābhārata • Ādi parva .

When सात्यकि annihilated the कौरवस् the dead bodies of thousands of शबरस् were heaped on the battle-field. [mh-7-119-46 ] Mahābhārata • Droṇa parva .

In early days the शबरस् lived in the kingdom of मान्धाता , their profession being murder and looting. [mh-12-65-13 ] Mahābhārata • Śānti parva .

शिव had once taken the form of forest-dwellers and शबरस् . [mh-13-65-17 ] Mahābhārata • Anuśāsana parva .

Many क्षत्रियस् lived for many years hidden in caves for fear of परशुराम , and as they had no association with क्षत्रियस् during the period, they became शबरस् . [mh-14-29-15 ] Mahābhārata • Āśvamedhika parva .