Feral hogs, or wild pigs, are an invasive species expanding their territory across the United States. Feral hogs are not native to North America and, according to some experts, cause $1.5 billion in damage each year. Noble Foundation wildlife consultants and researchers take a look at how the pigs got to our continent, where and how they have expanded their territory, and some of the problems they are causing for landowners and the agricultural industry.