The isolated rainforest inhabitants are believed to be still living the same primitive way they have done for the last 20,000 years
The shots of the confused-looking group are giving experts a sensational view of Neolithic way of life which has long since vanished from the planet.
One man can be seen launching a spear at the snapper as he swoops down low overhead.
Another shows a tribesman trying to string a bow - while another runs clutching what appears to be a large knife.
They are believed to have NEVER come into contact with anyone from the developed world before.
The photos were taken by chance by Brazilian photographer Ricardo Stuckert - and published exclusively by National Geographic - when their chopper was forced to divert due to poor weather.