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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 number of rats in New York City was unknown, and a common urban legend was that there were up to five times as many rats as people. ... York City the "Worst Rat City in the World", and rodentologist Bobby Corrigan called ...

en.wikipedia.org/wiki/Rat

Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are ... The group is generally known as the Old World rats or true rats, and ... Wild rodents, including rats, can carry many different zoonotic pathogens, .... However, it should be noted that there were other contemporary studies that ...

en.wikipedia.org/wiki/Brown_rat

The brown rat, also referred to as common rat, street rat, sewer rat, Hanover rat, Norway rat, ..... It is often said that there are as many rats in cities as people, but this varies from area to area depending on climate, living conditions, etc. ... The only brown rat-free zones in the world are the continent of Antarctica, some ( although ...

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.funtrivia.com/askft/Question96500.html

Aug 22, 2016 ... 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.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. ... On its own version of a World Population tracker, the U.S. agency estimates that humans ... in terms of sheer numbers are probably the brown rat (which, everyone agrees, outnumber ... Ants (many species), 10 billion billion, 3,000.

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

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 who are  ...

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 ...

www.linkedin.com/pulse/top-10-worst-rat-cities-world-when-its-so-great-1-lauren-arceri

May 9, 2016 ... About 90 percent of the world's islands have been overrun by rodent ... that meant there were about four rats pounding the pavement for every Parisian. ... Many areas of New Orleans are plagued with rats, especially older ...