Anthropological and genetic studies suggest multiple waves of migration into the Indian subcontinent. While the precise order and scale are debated, the Negrito and Proto-Australoid groups are generally considered among the earliest inhabitants, arriving from Africa in prehistoric times. Negrito populations are primarily found in the Andaman Islands (e.g., Sentinelese, Jarawas) in their most unmixed form in India, though some Negrito physical traits are observed in certain populations on the mainland as well.