Give a visiting ant a nice place to stay and it might stick around

Many insects enter the United States accidentally, as hitchhikers on various plants imported in commerce, but how many really stay?
Conventional thinking says the answer is in the numbers of both insects and times they enter, but new findings to be published in the Proceedings of the National Academy of Sciences suggest that opportunity alone is no guarantee of a successful invasion.

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<p><a href="http://www.physorg.com/news8196.html">Give a visiting ant a nice place to stay and it might stick around</a></p> <p> Many insects enter the United States accidentally, as hitchhikers on various plants imported in commerce, but how many really stay? <br>Conventional thinking says the answer is in the numbers of both insects and times they enter, but new findings to be published in the <i>Proceedings of the National Academy of Sciences</i> suggest that opportunity alone is no guarantee of a successful invasion.</p>