They prey on native animals and plants, dig up large expanses of soil and vegetation in search of food and foul fresh water. Feral pigs will eat many things including small mammals, birds, reptiles, frogs, crayfish, eggs, earthworms and other invertebrates, and all parts of plants including the fruit, seeds, roots, tubers, bulbs and foliage.
Feral pigs can host animal diseases that can be transmitted to other species. In dirt on their feet and fur, they can also spread plant pathogens such as Phytophthora cinnamomi, which causes plant dieback.
Feral pigs move around to new sites with food and water, and can breed rapidly to recover from control programs or droughts, and the impacts of feral pigs are intensified when their populations are large