Exotic / Invasive Species

Exotic plants and animals are species that have been introduced, either accidentally or purposefully, to areas outside of their native range. Exotic species that reproduce so successfully in their adopted ranges that they outcompete native species and alter native ecosystems are also termed “invasive.” Exotic, invasive species, from trees and grasses to frogs and fishes, currently pose significant threats to the diverse terrestrial and aquatic ecosystems of the American Southwest. Controlling or eradicating these species to protect native species (and especially native species of concern) is a priority for the National Park Service and other land management agencies in the Southwest.