Invasive species are imported as livestock, pets and attractions in zoos. Some hitch rides on plants, on the bottom of a boot, in the ballast of ships. Then they wreak havoc. Here's how we're ...

Here’s the thing about wild hogs in the U.S.: they aren’t just a nuisance. These invasive animals tear up crops, pastureland, and sensitive habitats, and they’ve spread into dozens of states with real ...