Plague of wild pigs

Giant Feral Pig from Australia

Oklahoma is battling a wild pig problem that has spread across the United States. The pigs, evolved from introduced wild boars or from escaped domestic stock, are prevalent in 36 states and have been sighted in 47 states, according to authorities who track their populations.

They are vicious critters that typically grow to 200 pounds, can run 30 miles per hour, jump three feet high and climb out of traps with walls up to six feet high, experts say.

"They are the ultimate survivors," said John Mayer, manager of the environmental science group at the Savannah River National Laboratory in Aiken, South Carolina. "They can live pretty much anywhere, eat pretty much anything, they don't have enough predators and they reproduce faster than any other mammal."

http://www.reuters.com/article/2013/08/24/usa-pigs-idUSL2N0GO01Q20130824

See also The Biggest Threat to the Planet