ANTHROPOLOGY group of young men Dayak (or Dyak or Dayuh; native people of Borneo) in front of their houses built on stilts. "Dayak" is a term defined in disuse for more than 200 ethnic subgroups settled mainly in the interior of Borneo; each with its own dialect; customs; laws; territory and culture; although with some features in common; each group is easily identifiable. The Dayak were traditionally animist belief; however many have been converted to Christianity and Islam; some recently. In times past were devoted to the tribal practice of "Headhunters" was defined as the practice of keeping the heads of the enemy killed. The consistency of the Dayak population is estimated to number 18 million to 20 million. Photographic Postcard; circa 1900