The Dayak people represent a group of Proto-Malayans inhabiting the inner part of Borneo (the largest Indonesian island). They are related with the Batak of northern Sumatra, Igorrote of Philippines, and various tribes of Timor, Celebes, Sumatra and Moluccas. During their history, the Dayaks experienced many external influences, especially of Hinduism, a religion that many ethnic groups of Borneo converted to. Still, Dayaks are highly conservative, and each village is organized in clans composed of various families that admit the authority of a sole chief; this structure allows a tight collaboration in field labor and other collective works. During the harvesting period, festivities accompanied by dances are kept.