Louisiana crawfish, cheatgrass, Russian thistle, Hottentot figs, rats, and sweet fennel. These and dozens of other seemingly benign flora and fauna have become some of the worst culprits in the destruction of ecosystems and native wildlife in the American Southwest and Baja California. Although widely publicized threats—such as pollution, land development, changes in the atmospheric condition, fire, and drought—are frequently credited with posing the greatest danger to indigenous animals and plants, invasive species are quickly becoming a far more insidious peril to the survival of native wildlife. A result of both accident and human intervention, the frequency with which exotic species are being introduced into nonnative environments is increasing at an alarming rate. In Unnatural Landscapes, Ceiridwen Terrill combines lucid science writing with first-person tales of adventure to provide a compelling introduction to invasion ecology and restoration management. Traveling aboard her...