IN DECEMBER 2016, Uwe Fritz at the Museum of Zoology in Dresden, Germany, was doing fieldwork in Colombia when something incredible crossed his path. While chugging across a vast expanse of wetland, he passed an enormous floating island complete with tall trees and a resident colony of howler monkeys. "Have you ever seen a howler monkey?" says Fritz. "They're huge! But the trees were large enough so the monkeys can permanently live in them. They do not swim." All told, the island covered an area about the size of two Olympic swimming pools.
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