Feral pigs (Sus scrofa) are environmental and agricultural pests. They cause damage to the environment through wallowing, rooting for food and selective feeding. They destroy crops and pasture, as well as habitat for native plants and animals. They spread environmental weeds and could spread exotic diseases should there be an outbreak. Research is continuing into techniques that will control feral pigs and minimise the damage they cause to native plants and animals. Wilpattu National Park - Sri Lanka.