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This is Scientific American 60-Second Science. I'm Christopher Intagliata. Got a minute?

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Sailors don't need to read the stars anymore--they've got GPS.

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But dung beetles do not have GPS.

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And it now appears that they use the Milky Way as a compass.

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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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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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But what's their plan on moonless nights?

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Dacke tracked the beetles as they successfully rolled dung away from the center of a circular sandbox.

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Then she blocked the beetles' starry view with tiny cardboard hats, and set 'em loose again.

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Without stars to guide them, the beetles traveling twisted, circular paths.

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Those findings appear in the journal Current Biology.

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The beetles' tiny compound eyes probably aren't sharp enough to make out individual stars.

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In a planetarium, for example, when only 18 bright stars were illuminated, the beetles got lost.

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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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Thanks for the minute, for Scientific American 60-Second Science. I'm Christopher Intagliata.

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