 Competition with the plantain squirrel ("Callosciurus notatus") represents another challenge for this species.More information is needed on population declines, but at present, the rate of the decline is not believed to merit listing in any category lower than least concern.The Sunda flying lemurs' two forms are not morphologically distinct from one another; the large form occurs on the mainland of the Sunda Shelf area and the mainland of Southeast Asia, while the dwarf form occurs in central Laos and some other adjacent islands.