These are the world's 10 worst invasive species

It's easier than ever for non-native species to invade someone else's home.

Thanks to huge improvements in the way we travel around the globe, species can hitch rides on boats, travel via imported wood, and even enter through people's suitcases when they bring them home from exotic vacations.

So which invaders are causing the most trouble in their new turf?

These 10 are the absolute worst.