At dawn, a handful of tourists sit in watchful silence on a floating platform, hoping to spot one of the giant river otters that live in this Amazonian oxbow lake. Their Peruvian guide peers through her binoculars. She directs their gaze to a macaw whose call descends from the rain forest canopy. Back at the lodge, the tourists relax in thatched-roof open-air buildings constructed from sustainable forest materials. At dinner, they enjoy a buffet of traditional Peruvian foods, some grown by...

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