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From plague-harbouring crustaceans, to sprawling superweeds and allergy-inducing insects, invasive species are one of the greatest threats facing biodiversity today.
And they are not only impacting ecology - the economy and human health are suffering too.
Invasives are a significant threat to a large proportion of the world's biodiversity
Graham Madge, RSPB
An alien invasive species is a plant, animal or microorganism that is not native to an area, but has been introduced, either accidentally or deliberately, by humans.
All this week, BBC News will be taking a closer look at some of the alien invaders that are in the UK.