A plant or animal that establishes itself in an area where it previously did not exist.
A non-native person who comes to a country from another country to permanently settle there.
Of or relating to immigrants or the act of immigrating.
An invasive weed.
Any destructive insect that attacks crops or livestock; an agricultural pest.
An animal regarded as a nuisance, destructive, or a parasite, vermin.
An annoying person, a nuisance.