It is typically found in undisturbed tropical lowland moist forests. This species does not readily use disturbed habitats, thus it is not usually found in gardens or plantations (M. Kinnaird pers. comm.). It is a largely diurnal, arboreal species that is often found in pairs. Its diet consists of a variety of leaves, preferring young leaves, and like many other arboreal folivores it spends much of its day resting in order to digest (Dwiyahreni et al. 1999).

This species occurs on the island of Sulawesi, Indonesia, and the adjacent Indonesian islands of Butung, the Peleng Islands, the Togian Islands, and possibly Muna (Flannery 1995). It ranges from sea level to over 600 m asl.

It occurs in many protected areas, including: Tangkoko-DuaSudara Nature Reserve, Bogani Nani Wartabone National Park, Lore Lindu National Park, Morowali National Park, and a host of forest reserves. This species is nominally protected by Indonesian law.