The Rattus norvegicus has fair vision, but their visual perception is actually heightened in dark areas.  This can correlated with being nocturnal. Two of the primary senses that brown rats rely on our sound and smell.  [7] The Rattus norvegicus has continuously growing incisors.  Therefore, the constant urge to gnaw on material is prevalent; this characteristic can be very detrimental to human created structures.  People will go through extensive procedures in attempting to terminate these pest. Through repeated use of pesticides in attempting to eliminate them has lead some Norway rats to become resistant, and even immune to the poisons. 


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As stated previously, the researchers in the Yukon discovered its first account of the Rattus norvegicus; never the less, they had to analyze certain characteristics or features to distinguish it apart from the black rat.  It was identified as a brown rat by the robust head and small ears covered with fine hair.  These traits are common in the Rattus norvegicus.  Another attribute that coined it to be wild was that it had a white colored abdomen and patches of white under its forearms. [6]  In this video, I thought the slanted stout  along with the small eyes and ears is clearly depicted just by watching the clip.  It also demonstrates the uneasiness the rat feels when eating.

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