INTRODUCED SPECIES

Native species are those plants and animals that are part of a specific geographic area, and have been a part of that particular environment for a very long time. They are well adapted to their local environment and are used to the presence of other native species within the same general habitat. Exotic species, however, are intruders. These species are introduced into new environments by humans, either intentionally or accidentally. These intruders are foreign to native species. They may cause no obvious problems and may eventually be considered as natural as any native species in the habitat. However, exotic species may also seriously disrupt delicate ecological balances and may produce many of unintended yet harmful consequences.

The worst of these unintended yet harmful consequences happen when introduced exotic species put native species in crisis by hunting them. This can alter the natural habitat and can cause a greater competition for food. Species have been introduced to environments all over the world, and the most destructive effects have occurred on islands. Introduced insects, rats, pigs, cats, toads and other foreign species have actually caused the endangerment and extinction of hundreds of species during the past five centuries. Exotic species are certainly a factor leading to endangerment.