March of the cat-sized RATS: Homeowner's horror after finding giant rodent at upmarket London home as pest controllers …

Giant rat photographed outside home in fashionable Belsize Park, London Homeowner Sam Firth estimated it was between 16 and 18 inches long Comes as pest controllers revealed the rise in number of mutant rats in UK Rodents are twice as large as normal and are resistant to traditional poison

By Stephanie Linning for MailOnline

Published: 14:40 EST, 22 February 2015 | Updated: 04:59 EST, 23 February 2015

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A woman was left horrified after she spotted a giant rat outside her home in north London.

Sam Firth photographed the rodent, which she estimated to be between 16 and 18 inches, as it peered through her back door in fashionable Belsize Park.

The sighting comes as pest controllers revealed the shocking epidemic of mutant rats - some as big as cats - across the UK.

The rodents, which have been seen been seen across the country over the past year, are twice as large as normal species and cannot be killed with traditional substances.

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March of the cat-sized RATS: Homeowner's horror after finding giant rodent at upmarket London home as pest controllers ...