walston's tube-nosed bat ("murina walstoni") is a species in the vesper bat family vespertilionidae, found in the greater mekong region of southeast asia, specifically the đắk lắk province of vietnam and the koh kong and ratanakiri provinces of cambodia. this species was discovered in northeastern cambodia in the van sai protected forest. they have tube-shaped nostrils (hence the name) which assist them with their feeding.