What can grow five feet long, up to 400 pounds and is one of the most destructive invasive species in the U.S.? Wild hogs. Wild hogs also called feral swine go by many names but are the same species as domesticated pigs found on farms. Nearly 300 native plant and animal species in the U.S. are in rapid decline because of feral swine, and many of the species are already at risk, according to Animal and Plant Health Inspection Service. Read more at the link in our bio.