Survival for Dance?

The _X_ are one of the adivasi indigenous peoples of the _Y_ Islands. Their present numbers are estimated at between 250-400 individuals. Since they have largely shunned interactions with outsiders, many particulars of their society, culture and traditions are poorly understood. Their name means "foreigners" or "hostile people" in Aka-Bea. Tourism is also a threat to them, with tour operators driving tourists along the road through the reserve every day in the hope of ‘spotting’ members of _X_. Identify X and Y