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Live ScienceUh-oh: One of the world's worst invasive species just showed up in the United ...Washington PostThe main concern -- both in France and in the United States -- is that New Guinea flatworms have been prolific on islands they've made their way to. It takes them a long time to end up on a new island, because they have to be carried in accidentally in ...Alien-Like Worm Invades USLive Scienceall 27 news articles »