From birds to bamboo, wild boars to Colombian hippos, invasive species are wreaking havoc on eco-systems around the world, and in your backyard.  Canadian ecology rock-star Ryan Brook has been tracking wild boars for years and says it's only a matter of time before the pigs outnumber humans in Saskatchewan, Canada. Eradicating them has proven challenging, and conservationist Arian Wallach says, don't bother, it's a waste of time. The boars are too smart.  Join Erika, Jay and Niki as they look at invasive species from two very different perspectives.