Learn about invasive plant and animal species, native species, and non-native species. Although world ecosystems are in danger from a whole host of varied and distinct threats, there are few issues more difficult to tackle or more complex to understand than invasive species control. These species arrive in an ecosystem in which they are not native and have not evolved, with no existing space within the habitat. Invasive species may outcompete, overtake, or cause general harm and disruption to their new ecosystems. Elimination and control are a necessary part of conservation, everywhere from Virginia to the world’s most remote island.