Some of those pigs headed north, where they eventually met up with Eurasian wild boars in New Hampshire, probably in the late 1800s, which were imported for hunting. The two hogs mated, so many wild pigs today are hybrids.
They are true pigs, not pig-like animals like those that roam the Southwest. The javelina is considerably less charming than a wild pig, and it isn't actually a pig at all.
Although they've made their way across much of the continent, wild pigs have apparently never lost their affection for Florida. It has everything they need.
Giuliano says they are vulnerable to heat, and thus need water to cool themselves off during the dog days of summer.
"We've got lots of water in Florida," he says. Plus the vegetation they need for sustenance and cover. So they're there to stay. Just like a lot of other folks.
"Everyone likes to live in Florida, I guess," Giuliano says. Even pigs.
Lee Dye's column appears weekly on ABCNEWS.com. A former science writer for the Los Angeles Times, he now lives in Juneau, Alaska.