Uncontacted Tribe of Amazon

Skin painted bright red, heads partially shaved, arrows drawn back in the longbows and aimed square at the aircraft buzzing overhead. The gesture is unmistakable: Stay Away.

Behind the two men stands another figure, possibly a woman, her stance also seemingly defiant. Her skin painted dark, nearly black.

The apparent aggression shown by these people is quite understandable. For they are members of one of Earth's last uncontacted tribes, who live in the Envira region in the thick rain-forest along the Brazilian-Peruvian frontier.

Thought never to have had any contact with the outside world, everything about these people is, and hopefully will remain, a mystery.

Their extraordinary body paint, precisely what they eat (the anthropologists saw evidence of gardens from the air), how they construct their tent-like camp, their language, how their society operates - the life of these Amerindians remains a mystery.

'We did the overflight to show their houses, to show they are there, to show they exist,' said Brazilian uncontacted tribes expert José Carlos dos Reis Meirelles Junior. 'This is very important because there are some who doubt their existence.'

Meirelles, who despite once being shot in the shoulder by an arrow fired by another tribe campaigns to protect these peoples, believes this group's numbers are increasing, and pointed out how strong and healthy the people seemed.

'These pictures are further evidence that uncontacted tribes really do exist. The world needs to wake up to this, and ensure that their territory is protected in accordance with international law. Otherwise, they will soon be made extinct.', said Miss Miriam Ross of Survival International, which campaigns to protect the world's remaining indigenous peoples.