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The risky business of Amazonian tree climbers

A botanist looks up at a man dangling 20 meters (yards) above ground in a tree that belongs to an endangered species in Brazil's Amazon.

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Botanist Marta Pereira, who is delighted to have secured his services, says there are only about 20 people who can do what he does. "For us, they're vital... without them we wouldn't have any samples," said Pereira, a researcher at the Amazon state university.