wild pigs that are known to eat deer have somehow invaded a fully fenced national park, leading experts to dub them 'the most invasive animals on earth'.
The beasts have been spotted at Elk Island National Park in Alberta, Canada, and munch on tree roots and birds in addition to the park's resident deer.
They've been a recurring problem since they escaped from farms in the area in the 1990s, so much so that the Alberta government has a wild pig removal program.
Perry Abramenko, who runs the removal squad, said that reports of the pigs are "increasing every year" and that they are unsure whether there's "hundreds or thousands" of them.
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