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Few details are known about the group, other than they are a hunter-gatherer community who live in small settlements and are "extremely healthy", he said.

It looks at the transition from hunter-gatherer societies to farming communities.

They were home to 400,000 people, including six hunter-gatherer groups who had lived isolated from the outside world for thousands of years.

The data shows that prehistoric hunter-gatherers approaching the rock painting sites by water entered a special sensory environment where reality sounded doubled.

Unlike kids in the United States, hunter-gatherer children in the Congo Basin have often learned how to hunt, identify edible plants and care for babies by the tender age of six or seven.