Aug 10, 2016 06:14 PM EDT
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.