The aborigine's people of Northern Borneo are commonly known as Kadazandusun, term assigned to the unification and classification of the two largest indigenous tribes - the ethnic groups of the Kadazan and Dusun.
Kadazans and Dusuns share the same language and culture, albeit with differences in dialect. Many consider the major difference between the two ethnic groups to be their traditional geographical influences.
Kadazans are mainly inhabitants of the flat valley deltas, conducive to paddy field farming, while Dusuns are traditionally inhabitants of the hilly and mountainous regions common to the interior of Sabah.
Kadazandusun also is made up of forty sub-ethnic groups of the Dusun and Kadazan, which location are widespread from coastal area to valley, then to forest as well as the mountains.
Of these 40+ sub-ethnic groups, all are belongs to "Austronesian languages family" one of the best-established ancient language families in the worlds and is on par with Indo-European, Afro-Asiatic and Uralic language families