Page last updated at 04:45 GMT, Wednesday, 15 October 2008 05:45 UK

Alien 'thugs' set to meet

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Two of the UK's worst alien invaders are set to meet.

Experts believe that the ranges of the plague-carrying non-native crayfish and the fierce Chinese mitten crab are beginning to overlap.

Scientists are unsure what will happen when the two alien invaders eventually cross paths.

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