This squirrel occurs in the mountains of Borneo. Stomach contents from 26 Mount Trus specimens were mostly insects, with fruit, nuts, leaves, and shoots also recorded. The current Mammal Diversity Database uses Sundasciurus everetti, while ADW retains the older genus.
Its back is gray to brown, with a gray-beige chin and underside. It has a long, narrow muzzle and a black tail with reddish-tipped hairs.
In 26 specimens from Mount Trus, insects were the main food; fruit, nuts, leaves, and shoots were also recorded. The account also reports foraging on the ground.
An extinction-risk assessment has not been added yet.