Two Philippine specimens were reported to have paler fur on the head, underside, and tops of the feet than Bornean specimens. The documented examples come from Borneo and Philippine islands.
Two specimens from the Greater Palawan region had paler fur on the head and underside, and paler fur on the tops of the feet, than the Bornean sample. The significance of the difference remains uncertain because few specimens are known.
One Bornean record came from a pitfall trap near the edge of tall dipterocarp forest, and a Calauit Island specimen was caught in bamboo. One Palawan individual was only tentatively identified as this species.
An extinction-risk assessment has not been added yet.