A preservative used to cure bacon is being tested as poison for the nation's estimated 5 million feral hogs. Descendants of both escaped domestic pigs and imported Eurasian boars, the swine cost the U.S. about $1.5 billion a year — including $800 million in damage to farms nationwide. Hunting and trapping won't do the trick for these big, wildly prolific animals. So, the U.S. Department of Agriculture kicked off a $20 million program this year to control feral swine, which have spread from 17 states in 1982 to 39 now. Read more at the Hunting Insider.