The Bornean white-bearded gibbon, (Hylobates albibarbis), also known as the Bornean agile gibbon or southern gibbon, is an endangered species of gibbon endemic to southern Borneo, between the Kapuas and Barito rivers.
Then, in came the marauding Ibans from Kapuas (in Kalimantan), a powerful headhunting tribe at that time, attacking them and chasing them out of their homeland.
Kapuas River | Kapuas |