Environmentalists and co-authors Drake and Love present the concepts of endangered species and biodiversity in this look at alien invaders and their impact. From the days of ailing ships and shipboard rats to the fungus that sparked the Irish potato famine to the deadly purple loosestrife strangling native wetlands, they examine extinctions and endangerments attributable to alien invaders. Learn where the invaders originated, how they travelled, where they settled, what they displaced, why the invaded natural system was vulnerable and what can be done