House mice three times their normal size have turned into carnivores threatening world's rare bird species

Today, the British-owned island, described as the home of the most important seabird colony in the world, still hosts 22 breeding species and is a world heritage site.

But as a terrible consequence of the first whalers making landfall there 150 years ago, Gough has become the stage for one of nature's great horror shows. Mice stowed away on the whaling boats jumped ship and have since multiplied to 700,000 or more on an island of about 25 square miles.



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