RIO DE JANEIRO, BRAZIL - In the mythology of the Yanomami Indians, butterflies came out from the edge of the world to continue life. Fate dictated that, at the moment when five 'voadeiras' (as the motorized "airboats" of the Amazonian rivers are called) docked in the Iriri Extractive Reserve, in the Terra do Meio (Amazon), a dozen yellow butterflies would feast in the sky.

It was there that a heterogeneous group of 50 . . .

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