Plants, animals or microorganisms which are introduced by humans into areas where they are not native. Exotics are often associated with negative ecological consequences for native species and the ecosystems. (Source: GEMET/UNUN)

Narrower: invasive species
Alternative labels:
exotic species
foreign species
introduced species
non-native species
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Follow up the links below to see InforMEA content related to alien species coming up from several external sources.