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Scientists exploring Suriname’s rain forests, some of the most remote on Earth, discovered 60 new species and a pristine region in need of protection.

Read Mark Jenkins’s previous “Navigations” essays. “They escaped into the jungle,” says Marvin, lifting his paddle from the hazel water and pointing toward the tangle of verdure. “Just running and running. Not knowing where to go. Not knowing what to eat. Lost and day by day starving and cut all over from the thorns, and…