Endemic to Borneo (Brunei, Kalimantan and Sarawak)
The painted treeshrew is endemic to Borneo and inhabits the forests of Brunei, Kalimantan and Sarawak. The first specimen was described by Oldfield Thomas from a collection from northern Borneo. It usually lives at lower elevations, below 300 m, though some specimens have been found hundreds of metres higher (Wikipedia, general species account).
Description: Wildlife of Malaysia guide, Wildlife of Everywhere (wildlifeofeverywhere.com); general species information paraphrased from Wikipedia (CC BY-SA)
Mammals of the World