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Robert Corrigan of the New York City Health Department is one of the world's leading urban rodentologists. Over the years he has gone the extra mile in order to understand more about his quarry, including once laying down ringed with peanut butter bait in an alleyway. He explains that the only way to vanquish the rat from urban centres is by changing human behaviour. (Image: Two rats eating discarded food in central London. Credit: Kirsty Wigglesworth/PA Wire)