India, March 23 -- I

n the torrential monsoon of the Amazon rainforest, the uncontacted people of the Mamoria Grande Indi-genous Territory in Brazil abandon their huts in the lowlands and move to higher ground.

Priscilla Schwarzenholz, an anthropologist and researcher with the indigenous-rights advocacy group Survival International, used the opportunity to visit the site of the huts recently, as part of an expedition organised by FUNAI, the indigenous affairs agency of the Brazilian government.

"We could see where they hung their hammocks," she says. "We saw Brazil nut shells, which is one of their main food sources; and baskets of different sizes, which they make, to carry things around."

There were traces from where the tribals had sc...