Their brightly-coloured skin and beautiful fins have made them a favourite pet.
But woe betide anyone who releases their guppy fish into the wild for these tropical creatures can upset the other inhabitants of British rivers and streams.
Researchers from the University of St Andrews, in Fife, have found that a lone female can create an entirely new population.
Read more: http://www.dailymail.co.uk/sciencetech/article-2039857/A-brood-apart-Household-pet-fish-favourites-turn-tropical-terrors-released-wild.html#ixzz1YZb7948t
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