Find out about the global problem of invasive species, the good and the bad, and what you can do to support the ecosystems around you.

What is an invasive species, anyway? -- Movers and shakers -- Accidental hitchhikers -- It seemed like a good idea at the time -- Not quite according to plan -- Invader number one -- All systems go -- All together now -- New kids on the block -- Taking over -- The story of Guam and the brown tree snake -- Making eco-mischief -- harming humans -- Stemming the flow -- Sounding the alarm -- Stamping them out -- Keeping a lid on them -- Easier said than done -- Thinking differently -- Finding the silver lining -- The story of Puerto Rico and the African tulip tree -- Living with climate change -- Africanized honeybees: "killers" or friends? -- Helping ecosystems repair themselves -- What you can do -- In my own backyard.