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1 .This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?
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2 .Sailors don't need to read the stars anymore--they've got GPS.
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3 .But dung beetles do not have GPS.
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4 .And it now appears that they use the Milky Way as a compass.
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5 .Dung beetles need a keen sense of direction so they can roll their dung patties away from the communal dung pile, and feast in peace.
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6 .Ten years ago, Marie Dacke at Lund University in Sweden and her colleagues discovered that some dung beetles use polarized moonlight to keep a straight course.
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7 .But what's their plan on moonless nights?
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8 .Dacke tracked the beetles as they successfully rolled dung away from the center of a circular sandbox.
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9 .Then she blocked the beetles' starry view with tiny cardboard hats, and set 'em loose again.
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10 .Without stars to guide them, the beetles traveling twisted, circular paths.
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11 .Those findings appear in the journal Current Biology.
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12 .The beetles' tiny compound eyes probably aren't sharp enough to make out individual stars.
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13 .In a planetarium, for example, when only 18 bright stars were illuminated, the beetles got lost.
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14 .But the faint streak of the Milky Way seems to be just enough light to point them to a dung dining hole--no reservations required.
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15 .Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.
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