Species that are brought to an area where they naturally do not occur, are called alien, introduced, or exotic species. These plants can have devastating effects on existing biodiversity, as they compete with, and sometimes destroy, the native species. For example, native plants are literally contravened and eaten by introduced animals, such as goats and pigs. Therefore these plants are now extinct in Hawaii, and some other parts of the country. Introduced plants, like kudzu, can have the same impact. They can overcrowd , and destroy the native species. Although Hawaii appears very lush and green, most areas tourists see, do not contain native species anymore.