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en.wikipedia.org/wiki/Rats_in_New_York_City

Rats in New York City are prevalent, as in many densely populated areas. For a long time, the exact number of rats in New York City was unknown, and a common urban legend was that there were up to four times as many rats as people. ... New York City the "Worst Rat City in the World", and rodentologist Bobby Corrigan ...

www.animalplanet.com/wild-animals/10-worst-rat-cites-in-the-world

These 10 cities are among the most rat-plagued places on the planet, although rodent control efforts are (in most cases) always ongoing to try to keep the tally in  ...

www.npr.org/sections/thetwo-way/2011/11/03/141946751/along-with-humans-who-else-is-in-the-7-billion-club

Nov 3, 2011 ... There are now 7 billion people, according to the U.N.'s population division. ... of sheer numbers are probably the brown rat (which, everyone agrees, ... According to the FAO, there are around 1.4 billion cattle in the world and about 1.1 billion sheep (in 2009). ... Ants (many species), 10 billion billion, 3,000.

www.funtrivia.com/askft/Question96500.html

Here are some examples of the estimated number of rats worldwide and in select cities: It has been estimated that there are up to seven billion ...

www.snopes.com/critters/wild/rats.asp

ORIGIN. Rats (at least the kinds commonly kept as pets) are for the most part intelligent, clean, quiet, sociable, and even affectionate. Still, there are many people ...

www.bbc.com/earth/story/20160407-the-worlds-largest-rats-are-the-size-of-small-dogs

Apr 8, 2016 ... "There is absolutely no evidence that brown rats found in the UK are ... This bulkier rat can weigh as much as 8.8 lb (4kg), as much as a ...

discovermagazine.com/2006/dec/20-things-rats

Dec 7, 2006 ... Jack Black the royal rat catcher, Jacko the world-champion rat killer, rats who mate ... There is approximately one rat per person in the United States. ... 9 Well, junk food isn't much better: Rats eat their own feces, purely for the ...

www.quora.com/How-many-rats-live-in-the-world

They say for every human their is at least one rat. Get Rataway Fragrance from Non Toxic Rat ... Why are there so many rats in Bangalore? What happens if we ...

biology.stackexchange.com/questions/1066/how-many-mice-are-on-the-earth

Feb 16, 2012 ... Mark-recapture is the most frequently used method for small mammals. It's best when combined with uncertainty estimates and population ...