Once they’re out in the open, feral hogs simply breed too fast for hunters to keep up. To wipe out a population, you need to shoot 60 to 80 percent a year, says Mayer, but recreational hunting can only cut their numbers by about a quarter. And while plenty of non-human predators would enjoy some pork—including mountain lions, alligators, coyotes, and hawks—there are just too many pigs to make a dent. Meanwhile, they thrive almost anywhere between the Arctic and the tropics and females can birth two litters every year. They are “opportunistic omnivores,” which is a fancy way of saying “if it’s got a calorie in it and they can get their mouth around it, they’ll try to eat it,” says Mayer.