There are thought to be between 4m and 5m feral hogs at large in America, spread across 38 states. The biggest population is in Texas, but states from Florida to Oregon are infested and worried. Feral hogs destroy the habitats of plants and animals, spread diseases, damage crops, kill and eat the eggs and young of wildlife and sometimes menace people with their aggressive behaviour.Via The Economist.
The problem originated with the Spanish conquistadors, who took herds of pigs with them as they marched across the American continent. Stragglers reverted to their wild state. Much later “sportsmen” began releasing hogs into reserves for commercial hunting. More recently still declining pork prices have induced farmers to turn some of their stock loose rather than continue feeding them. Pigs produce so many piglets that a feral herd can double or even triple within as little as a year.