20 Facts About Rats

12 Rat baiting, a popular sport in 19th-century London, pitted a man or a dog against hundreds of rats. Jacko, a 13-pound bull terrier, set the record in 1862 when he killed 100 rats in 5 minutes, 28 seconds.

16 Rats do not sweat. They regulate their temperature by constricting or expanding blood vessels in their tails.

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