Add Yahoo as a preferred source to see more of our stories on Google. In the beginning, there were pigs. Domestic breeds, such as Duroc, Landrace and Yorkshire have been staples of the Prairie ...

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 tackling ...