The answer is invasive species.
Invasive species are species that are not native to the specific ecosystem, but they are capable of spreading widely through the ecosystem. This way they can threaten native species of the ecosystem or cause environmental harm.
After being introduced into the
Hawaiian Islands, the cane toads greatly affect local ecosystem. In the new area, they
have a few natural predators and are able to spread. If they spread beyond
the area they are introduced, they become invasive species which can
overgrow native biotopes and are a great threat to the local biodiversity.
This could lead to the extinction of some native species.
