The Hoolock Gibbon, India's only ape species (distinct from monkeys), is primarily found in the northeastern states, especially Arunachal Pradesh, Assam, and Meghalaya. They inhabit tropical and subtropical forests in the region. Madhya Pradesh and Andhra Pradesh are not within the Hoolock Gibbon's natural range, which is restricted to the northeast's forested ecosystems along the Brahmaputra and Barak valley systems.