What meat will eat people?

Of all the animals commonly eaten by humans, the pig is the only one that will return the favor.

Mark Essig, Lesser Beasts: A Snout-to-Tail History of the Humble Pig (New York: Basic Books, 2015), Prologue

Pigs make piglets!

The same quality that makes feral pigs a problem—prodigious fecundity—has delighted farmers. Cows, goats, and sheep provide milk, a bountiful and consistent source of protein. Oxen pull plows and carts, and sheep are shorn for wool. Pigs do not pull plows; they give no milk and grow no wool. Pigs produce only one thing: more pigs. Many, many more pigs.

Mark Essig, Lesser Beasts: A Snout-to-Tail History of the Humble Pig (New York: Basic Books, 2015), Prologue

Pig drives!

Think of it: pig drives! Like cattle dries, only stranger! Who knew a pig could walk that far or would travel in the desired direction? . . .

Mark Essig, Lesser Beasts: A Snout-to-Tail History of the Humble Pig (New York: Basic Books, 2015), Prologue

A few farmers from Lexington, Kentucky, walked their hogs through the Cumberland Gap and all the way to Charleston, South Caolina, distance of more than five hundred miles.

. . .

Because droving was a decentralized trade, it's impossible to know its full scale. It is clear, however, that hog drives were at least as significant as the more celebrated cattle drives. The largest cattle drives, from Texas to Kansas, involved as many as 600,000 cattle a year, but they lasted just fifteen years or so. Hog droving, by comparison, involved hundreds of thousands of animals during peak years and on some routes lasted nearly a century. From Kentucky alone, as many as 100,000 hogs per year were driven east to Richmond, Baltimore, and Philadelphia.

Id., ch. 12.

Multiplying pigs

Pigs are the most prolific large mammal in North America. In some ways, they're like a big, ugly rabbit, capable of having two litters a year. Research indicates that we need to remove about helf of the wild hogs every year to keep the population levels under control. If not, their numbers grow in a hurry. 

Kim DeLozier & Carolyn Jourdan, Bear in the Back Seat II: Adventures of a Wildlife Ranger in the Great Smoky Mountains National Park (2014)