An introduced species is one that is not native to an area. Most introduced species have no natural predators, so they reproduce without limits. They can take over habitats and crowd out native species. A native species is one that is original and adapted to an area. The native species in an area can be completely wiped out by a successful introduced species. In Australia, the introduction of rabbits caused the extinction of many of the native species. The rabbits reproduced Quickly and ate the grass that many of the native species needed for food. The native species were not able to survive alongside the rabbits, and many became extinct. One of the most important ways people are protecting biodiversity is by preserving ecosystems. Our country and others have set aside national parks, refuges, and reserves. Private organizations have bought whole habitats. These areas are protected so that species can live and interact in their natural environments.