<http://schema.org/articleBody>
" \u00BB A collapsible skeletal structure allows rats to fit through holes the size of a quarter. \u00BB Brown rats can bite six times per second, exerting a pressure of 7,000 pounds per square inch. On Mohs&amp;#039; scale of hardness, a rat&amp;#039;s incisors are rated 5.5--harder than iron, which is 4.0. \u00BB The life expectancy of a rat is approximately one year. In that time, a rat may have sex 20 times a day and has the potential of producing 15,000 offspring with one mate. \u00BB City rats weigh 40 percent more than noncity rats and grow twice as fast, reaching a maximum of 20 inches and two pounds.  \u00BB During the 19th century, men would cram into saloons and stand around dirt pits to watch dogs fight hundreds of rats. The American record of 100 rats killed in 6 minutes and 40 seconds was held by a black and tan called Jack.  \u00BB In 1949, rodent ecologist Dave Davis put the rat population of New York City at one rat for every 36 people, or 250,000 rats. While no one really knows for certain how many rats there are in New York today, the number has been estimated to be as high as 36 million. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.esquire.com/entertainment/books/reviews/a1284/esq0404-apr-books/>