Monkeys gather on the shore of Cayo Santiago, known as Monkey Island, in Puerto Rico on Wednesday, October 4, 2017. One of the first places Hurricane Maria hit in the U.S. territory Sept. 20 was this 40-acre outcropping off the east coast – one of the world's most important sites for research into how primates think, socialize and evolve. (Photo by Ramon Espinosa/AP Photo)
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