Undiscovered, unfound, uncontacted, untouched tribals

This tribe of Indians of the Ethno-Environmental Protected Area along the Envira river, in the Brazilian state of Acre, were photographed during a flight in May 2008. They are challenging the chooper from where the pic was taken with their bows and arrows and have their bodies painted red. Quite a topic for channels like discovery and national geographic to make a documentary on.. Check it out here and here