The population of Borneo consists mainly of Dayak ethnic groups, Malay, Banjar, Orang Ulu, Chinese and Kadazan-Dusun. The religion of the majority of the population is Muslim, and some indigenous groups continue to practice animism. Meanwhile, approximately 91% of the Dayak are Christian, a religion introduced by missionaries in the 18th century. In the interior of Borneo are the Penan, some of who still live as nomadic hunter-gatherers. Some coastal areas have marginal settlements of the Bajau (sea gypsies), who historically lived in a sea-oriented, boat-dwelling, nomadic culture.