Plain Treeshrew Tupaia longipes at Meriuk Farm Stay , Tutong, Brunei. The posture and coloration of this individual clearly mimics that of the predatory Yellow–throated Marten Martes flavigula which is also found in the same area. 

Camera trap photos by Jungle Dave.

Plain Treeshrew Jungle Dave DSC00143
In Sabah, the Plain Treeshrew is the second most common treeshrew after the Large Treeshrew  and even more common than Large Treeshrew  in tree plantations. Plain treeshrew feeds almost exclusively on ants and termites.

According to the zoologist Louise Emmons, the alarm call of the Blue-headed and Black Crowned Pittas mimics the alarm calls of Plain Treeshrews

ALARM CALL MIMICRY OF PITTAS & PLAIN AND LESSER TREESHREWS

There is a curious similarity between the whining alarm calls of Lesser and Plain treeshrews and that of the terrestrial pittas Blue-headed Pitta (Pitta baudii) and Black-crowned Pitta (Pitta ussheri), that intimately share their microhabitat.

Before I knew them well, I sometimes mistook a faintly heard call of one taxon for the other.  Once, seeming to answer, a pitta instantly called after an alarm of T. longipes, perhaps also mistaking the caller (birds are easily tricked to respond to imitated calls).

Emmons (2000). Tupai: A Field Study of Bornean Treeshrews.