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Rats that are the size of sheep might a good horror movie story. However, scientists from the University of Leicester in England that in the future, there could really be giant rats on the Earth. They could be as big as sheep and up to 80kg. Rats are all over the Earth. They now the strongest animals on many small islands. One of the reasons for this is that they on ships and to areas that never had rats before. Another reason is that many larger animals are extinct, so there are fewer animals that might kill rats. Researcher Dr Jan Zalasiewicz said: " enough time, rats could probably to be…the world's largest rodent."

Dr Zalasiewicz said rats are one of the best examples of a species that we have around the world, and have successfully to many of the new environments. He said: "There will be future thin rats, future fat rats, slow and heavy rats, fast and ferocious rats, probably future aquatic rats - the list on." After the dinosaurs out, many small animals slowly bigger and bigger. The same thing could with rats if there no animals left that and kill them. Dr Zalasiewicz also that "super-rats" will start other species to make them . This will have a big impact on food chains. He did not say what humans would do about giant rats around everywhere.