C. notatus is a very adaptable species, as it is found in secondary forests, plantations, and all kinds of habitats, though not so common in pristine forest (Payne et al. 2005, Han pers. comm. 2006). Ancestral habitats appear to be mangroves and major natural disturbances along big rivers (Payne et al. 2005). Now it is very common in towns, scrub, secondary forest, forest edge and urban parks (Payne et al. 2005, J. W. Duckworth et al. pers. comm. 2006).
This is a diurnal and arboreal species (Saiful and Nordin 2004), though it dies descend to the ground to forage (Han pers. comm. 2006). The diet of this species consists of fruit (42%) and bark 40% (A. Saiful pers. comm. 2006), as well as insects and rubber tree latex (Lekagul and McNeely 1988).

This species is found from Peninsular Malaysia and peninsula Thailand to Java, Bali, Lombok, and Borneo (Lekagul and McNeely 1988, Thorington and Hoffmann 2005). It is also widespread on smaller islands. The population on Salajar island, south of Sulawesi, has been introduced possibly from Java (Musser 1987). This species is found from lowland up to 1,500 m.

It occurs in many protected areas across its range and there are no conservation measures needed for this species (J.W. Duckworth et al. pers. comm. 2006).