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This is Scientific American 60-Second Earth. I'm David Biello. Your minute begins now.

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On a visit to the Tampa area way back when, I enjoyed a stinging reminder that not all little red ants are benign.

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Introduced fire ants in the U.S.South are just one example of how ants from one region can set up colonies in another.

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South American so-called "crazy" ants now damage electrical equipment in the U.S.

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And super-colonies of Argentine ants are all over Europe.

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To gauge such expansions, scientists, including Scientific American contributor Rob Dunn, tried to track introduced ant species in the Netherlands, New Zealand and the U.S.

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They found that some 252 ant species have infiltrated the three places,

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mostly accidentally, for example, in shipping containers full of fruit or wood.

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The researchers think their official count is low,

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they estimate the true number at nearly a thousand species.

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And most can make a permanent home on new shores, thanks to coming from nearby, climatically similar regions.

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The research appeared in the journal Biology Letters.

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Expanding their empires may be good news for ants.

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But maybe not for humans, as I learned all too painfully.

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Your minute is up, for Scientific American 60-Second Earth. I'm David Biello.

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