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Attack of the invasive species
Beware the mute swan and zebra mussel
 

America is facing an animal invasion on multiple fronts. These invaders aren't looking to start a war — only to make a home. But however benign their intentions might be, invasive species unfortunately pose threats to native species and upset the balance of native ecosystems. Some are relatively new arrivals; others have been fortifying their position for more than a century. All are especially adept at out-eating and out-reproducing their native neighbors. To help you guard the home front, we lined up 12 of the most pernicious invasive animals in the U.S.:

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