invasive species

These descendants of wild boars were brought over from Europe decades ago. They're highly invasive and hugely destructive — threatening native bears and deer in Great Smoky Mountains National Park.

Burmese pythons in the Everglades are taking a big toll on native wildlife. To combat their spread, the state is holding its second Python Challenge — a hunt expected to draw over 1,000 participants.

Asian carp are not just a problem for the Great Lakes region. Fish processors in Kentucky are finding novel ways to dispose of them — including sending them to China, where they are prized as food.