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WEED SPECIES: In ecology. An invasive species, also called an invasive exotic, is an organism that is intentionally or accidentally introduced to an area where it is not native, and where it successfully invades and disturbs natural ecosystems, displacing native species. The term is most often applied to, but not limited to, plants. See also kudzu, water hyacinth, zebra mussel, Burmese python, eco-tourism, sociopath.