Biologist travels the globe chasing invasive species
Sometimes it's intentional, out of necessity or amusement, but often it happens inadvertently, thanks to the ballast water in our boats, for instance.
According to the new book, "The Attack of the Killer Rhododendrons," these organisms have the potential to be just that: killers.
Author Glen Chilton tells Daybreak host Chris Walker about his trip around the world in search of these creatures.
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