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1 .This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 .Why did the tiny nematode worm cross the road?
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3 .Well, for all the usual reasons.
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4 .But a more interesting question is "how did it make the crossing?"
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5 .Turns out, it may have hitched a ride, inside a slug, or other invertebrate.
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6 .That's according to a study in the journal BMC Ecology.
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7 .Nematodes are about a millimeter long.
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8 .They're often found on decomposing fruits or rotting plants, where they feast on the resident bacteria.
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9 .But when that food source is exhausted, how do these diminutive diners make their way to their next meal, which could be in a mulch pile a major trek of several yards away?
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10 .To find out, researchers hit the compost heap, and they collected some 600 slugs and 400 centipedes, spiders, beetles, flies and locusts.
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11 .And they found that the innards of slugs, centipedes and woodlice are littered with live worms that the larger creepy crawlies accidentally ingested as they snacked.
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12 .But what becomes of these itinerant intestinal interlopers?
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13 .To solve that mystery, the researchers exposed 79 slugs to more than a million nematodes that had been tagged with a fluorescent marker.
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14 .And they saw that the worms not only survive a southbound trip through a slug's guts, they emerge none the worse for where-they've-been when their ride takes a bathroom break.
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15 .Sure, a chugging slug isn't exactly high-speed rail.
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16 .But its bacteria-filled belly means that, for the nematode passengers, the dining car is always open.
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17 .Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.
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