"The startling images of an uncontacted Brazilian tribe taken from a plane a few years ago had many people captivated.

Some were stunned to learn that while NASA is sending probes to different planets in search of life, there are still small human groups on our own Earth that remain in complete isolation from the rest of the world.

Isolated tribes today reside on different continents including Asia, Oceania, and South America in the densely forested areas.

According to Glenn Shepard, an anthropologist at the Goeldi Museum in Belém, Brazil, most isolated groups in the Amazon rainforest live along the border areas between Peru, Brazil, Bolivia, and Colombia.

It is difficult to know the exact way of life of these tribes as they avoid contact with the outside world, although some studies can be done by following their traces in the forest."

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Uncontacted Tribes in the Amazon: Isolated by Choice (The Epoch Times 2/5)