AMERICA is facing an explosion of MILLIONS of 400lb feral hogs that can spawn at three months old.
The huge wild pigs are rapidly multiplying in number and have the ability to wipe out entire farms, in what has been called a 'Pig Bomb.'
Research scientist Dr. Jack Mayer, a zoologist who has been researching wild pigs for 40 years, has warned that the population could keep on growing unless there is a swine flu epidemic.
With a population of nine million in 39 states, feral hogs are expanding at a rate of 35,000 square miles a year.
Dr Mayer said: "It's a crazy situation with everything that's happened in what I call the Pig Bomb, which has exploded in North America.
"There's not another animal that can put little feet on the ground quicker than a wild pig.
"They're not cute little pigs, they're wild animals, and they would hurt you."
Because of global warming, there are more acorns, bulbs, roots and tubers for little piglets to eat, increasing their survival rate, according to the expert.
The feral pigs can also start reproducing at the tender age of three months old - and they do so twice a year.
FERAL SWINE BOMB
California and Texas have encouraged recreational hunting as a way to reduce their pig populations in a bid to tackle the crisis.
But even if three-quarters of the population is killed off, they would be able to fully repopulate within three years.
Dale Nolte, manager of the National Feral Swine Damage Management Program at the U.S. Department of Agriculture, said: "I've heard it referred to as a feral swine bomb.
"They multiply so rapidly. To go from a thousand to two thousand, it's not a big deal.
"But if you've got a million, it doesn't take long to get to four million, then eight million."
This breed of 'super pig' can grow large and have litters of ten or more.
They can also carry bacterial diseases and parasites - while causing up to $2.5 billion worth of damage to agriculture as they barge through plants and livestock.
Pigs end up going wild after they escape from their farm enclosures.
After breeding in the wild, the offspring are classed as feral and grow tusks.
They also roam over vast distances of up to 19 square miles and sometimes turn nocturnal making them even harder to track.
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In Montana, residents have been encouraged to call a 24-hour hotline if they spot a feral hog, so wildlife staff can trap and kill the animals.
Christine Rollins, 59, was mauled to death at a house in Texas, US after being knocked down by the beasts.
Attacks from wild hogs are pretty rare with only four feral-hog related deaths happening since 1800, according to Wildlife Damage Management.