A species that did not originally live in an area. Usually, members of the species are released by humans and they figure out how to live and reproduce in the new area. Rock Pigeons (city pigeons), European Starlings, and House Sparrows are all introduced species in North America and other continents.
Any species introduced by human agency into a geographical region outside its natural range. The term includes non-established (‘alien') species and established non-natives, but includes hybrid taxa derived from introductions (‘derivatives') (Eno et al, 1997).
organisms that have been brought into an area in which they do not naturally occur. Introduced species can compete with and cause problems for native species. Introduced species are also called exotic, non-nativeand alien species.