Photos released on May 29 show bow-and-arrow toting tribesmen near the border of Brazil and Peru. Though they've probably had contact with other indigenous people, they are believed to have never been contacted by the industrialized world.
Amazon expert Thomas Lovejoy thinks the previously unknown tribe is probably the remnant of a larger indigenous tribe that was forced deeper into the Amazon rainforest by encroaching settlements. Lovejoy said that contact is probably inevitable.
"The right answer is to have the kind of contact and change that the tribes themselves manage the pace of it," Lovejoy said. The area where the tribe was sighted is home to about half of the estimated 100 uncontacted tribes remaining in the world.