American mink
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Mass American mink removal in Scotland

1 February 2011 Last updated at 09:35 GMT

Invasive species - animals and plants introduced into a country from overseas - are a major threat to global biodiversity.

But now time may be running out for one animal in the UK. A project led by the University of Aberdeen has carried out one of the world's biggest eradications of an alien invader - the American mink.

Our science reporter Rebecca Morelle has been to Aberdeenshire to find out more.