The least pygmy squirrel is a very small squirrel endemic to Borneo. It moves along tree trunks and lianas and feeds mainly on bark.
Its back is olive-brown, with orange-brown on the nape and crown. The tail is grizzled brown and orange-brown, and the underside is pinkish brown.
It moves on trunks and lianas from near the ground to about 10 m high. Bark is its main food; lichens and small insects are described as possible or supplementary foods.
An extinction-risk assessment has not been added yet.