Across America, hogs and hunters fight a hidden war. One side wields rifles, machine guns, helicopters, poison, and traps. The other side is winning. Feral hogs arrived with Columbus and the conquistadors in the 1500s. They were left behind so future expeditions would have edible animals when they arrived. As an invasive species, hogs were incredibly successful, but their numbers only really took off in the last 50 years, experts say. They may now be impossible to eradicate. “They’ll be around for the Second Coming,” said Texas ranch owner Allen Williams. The worst danger from hogs is not the destruction of crops, environmental damage, or even the occasional attack on people. It’s the chance that they will catch African Swine Fever (ASF), an incurable disease that recently resulted in the death of half of China’s domestic pig stock—about 200 million pigs worth $100 billion. If ASF enters wild hog populations, …