Wild Animals

Top 10 Worst Rat Cities in the World

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London, England
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Rats are also a big issue in London. Like the Seine in Paris, the River Thames has long been a major rat-magnet. But lately, rats have been thriving more than ever due to construction efforts for the 2012 Olympics and the aftereffects of the economic recession -- more abandoned properties mean more places for rats to roost undisturbed.

London's rats are also getting bigger than ever, at least partially thanks to increased littering -- especially of the fast-food variety -- by on-the-go Brits. Some big squeakers are reportedly growing up to double the usual size.

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