The nation's six million feral pigs are destroying crops and preying on endangered species. But the most serious threat they pose is to human health.
One of the most destructive and rapidly spreading invasive species on the continent has been found for the first time in a Canadian national park.
New study spotlights influenza virus that could wreak havoc if it adapts to humans.
'There's nothing good about them.' They carry disease and cause billions in damage
CTV News, Edmonton
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