Also known as wild boar and feral hogs, feral swine are essentially just domestic pigs that are free-ranging. They were originally introduced to the Americas when the Europeans began colonizing, and since then have proliferated throughout the continents due to additional releases, popularization of boar hunting, and protections of the species as a game animal. Feral Swines harm ecosystems by taking food from native predators, destroying plant communities and harming other types of wildlife. They can be found all across North America, with the exception of the extremely cold parts.
Photo credit: Steve Hillabrand/USFWS