Invasive species are found around the globe, and some of them seem almost unstoppable. But which are the worst? How Invasive Species Work: http://science.howstuffworks.com/environmental/green-science/invasive-species.htm What the Stuff?! episodes are available every Monday and Friday at Noon ET. Subscribe http://bit.ly/1AWgeM7 Twitter https://twitter.com/HowStuffWorks Facebook https://www.facebook.com/HowStuffWorks Google+ https://plus.google.com/+howstuffworks Website http://www.howstuffworks.com Watch More https://www.youtube.com/HowStuffWorks Over the years, humans have imported other animals from all over the world. Sometimes it’s because a species is so cute we _have_ to take it out of its natural environment. Other times it’s because we need them to solve a problem we can’t… like eating a bunch of annoying bugs. But if the species doesn’t have a natural predator in their new home, they can become problems on their own. Like CARP - Imagine me throwing a bowling ball at your