Mutant rats - should we be worried?

In recent weeks, a rise in 'killer mutant rats' has been reported, spreading across the South of England and breeding rapidly.

But are they the giant, red-eyed, salivating beasts we imagine them to be? Zoologist Mark Amey and his sister Susan, an animal control officer, are here to explain the truth behind the headlines, and how to deal with the problem.

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