You see this nice beautiful clean wetland or stream and then the pigs move in and the water gets dark and unusable. They eat anything from an adult white tail deer down to small mammals, birds, frogs, huge ecosystem impacts as well. Then, arguably, the one that keeps me awake at night is the disease side.
They can potentially harbour disease and parasites, they can infect humans, pets, wildlife and particularly notable, livestock. African Swine fever is big global crisis right now, especially in Europe, Asia and in Africa. Big concerns to the domestic pig industry and we know from Asia and Europe that wild pig types can actually harbor and spread that disease. That's really, I think, mainly why we've seen a huge interest in Canada about doing something all of a sudden now in the last couple of years, mainly because of African Swine Fever.
Source : Farmscape