The Norway Rat is not a native species to North America. This rat is supposed to be originally from Asia, but it was able to immigrate into North America by following people. As strange as it sounds, these rats live almost anywhere there are people except Antarctica. There are several places where these rats could be found such as sewers, basements, dumps and etc. The Norway Rat is also known for being really good swimmers and climbers. They also have a short gestation period of twenty two days and they have at least seven litters every year. In each of the litters, there are approximately two to fourteen newborns. Unfortunately, the Norway Rat has a short lifespan of about three years. The Norway Rat is categorized as an invasive species due to the amount of diseases it transmits and the destruction of property where it dwells.
http://www.fcps.edu/islandcreekes/ecology/norway_rat.htm
http://invasive.btnep.org/oldcontent/invasivesinla/insectsandotheranimals/norwayrat.aspx
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