Disease
Wild pigs can transmit several different diseases to livestock, and more rarely, humans. The most common diseases include anthrax, tuberculosis, brucellosis and pseudo-rabies. The pigs represent a much bigger threat to livestock than humans, although transmission to humans through other animals is possible. The diseases are generally spread through direct contact or by infected feed or water. Wild pigs' habit of wallowing in and spoiling water supplies is the main transmission method.
Damage to Habitat
Wild pigs are responsible for damage to both local flora and fauna. They compete with native species of birds and animals for resources. Some of their habits are also believed to contribute to declining numbers of other animals. Wild pigs wallow in ponds and creeks, including urinating in them, thus contaminating the water. This leads to erosion on banks and decreased fish populations.
Damage to Crops
Due to their rooting habits, wild pigs can damage large areas of land. This rooting can cover entire fields and reach depths of three feet, which severely damages pastures and potential crop land. Since wild pigs are opportunistic feeders, they routinely eat a variety of farm crops. Wild pigs also "rub" against objects and can cause significant damage to structures and fencing. Wallowing also reduces water quality which can impact irrigation.
Danger to Animals
Wild pigs present a number of threats to other animals, including humans. They are best described as omnivores, and as such will also eat meat. Wild pigs have been known to kill small, weak or injured animals. They will also attack and kill domestic livestock such as young goats and sheep. The pigs are dark in color and active at night, thus presenting a hazard to drivers.