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SÃO PAULO, BRAZIL - Let’s look at it this way. Some sounds are scarier than others. It all depends on your fear threshold. The scratchy sound of a mouse running across a wooden floor or a creaking door at night might bring beads of sweat to some foreheads and none to others.

In the vast reaches of 1.5 million square miles of the Brazilian Amazon, part of the largest tropical rainforest in the world and six or seven times the size of Texas, and which contains, according to the World Wildlife Fund, ten percent of the world’s . . .

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