Where Canada's 'super pigs' are most likely to invade the US — and potentially cause millions of dollars in damage

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A refal hog misses the trap, and roams free at Barker-Addicks reservoir on Thursday, Sept. 18, 2014, in Houston.
Wild pigs already cause billions of dollars in damage to agriculture in the southern US.

Mayra Beltran/Houston Chronicle/Getty Images

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