Thus, they are highly invasive and frequently show up in new regions. They easily hide among objects and in soil where there's moisture, so moving any type of container or plants around the world has allowed them to colonize new areas. "However, some have been here for over 100 years, so they are well established.
are not native," says Matt Bertone, an entomologist at NC State University. Greek root word platy meaning flat and the Greek root word helminth meaning worm. "The majority of land flatworms in the U.S. Worms have a definite anterior (head) end and a posterior (tail) end. Over the course of the past couple of hundred years, global commerce has helped the hammerhead worm wriggle its way into most suitable habitats in the world - and there are a lot of suitable habitats out there, although you're unlikely to find them in a desert or at the top of a mountain. These predatory planarians are native to tropical and subtropical regions of the globe, so they love wet, warm spots. But hammerhead worms, all members of the genus Bipalium, aren't something to get too fussed about as they're not a new thing in the U.S., or in most places in the world - they've been common residents of American gardens since the early 1900s.
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