Habitat: Rattus norvegicus is a very versatile species that can adapt to harsh climates of the cold and heat.  For example, there was a study done in the Yukon that actually analyzed the brown rat for the first time in 2010.  What is surprising is that  Alaska, bordered by the Yukon, has only had nine recorded brown rats between 1951 and 2007. [6]  To express the adaptability of the Rattus norvegicus, around this area of the world, summers can be as warm as 90°F and as cold as -40°F in winter.

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Rattus norvegicus that inhabit areas of land away from buildings and civilization prefer high levels of cover such as scrub vegetation, overgrown ditch banks, hedgerows, and fodder crops.  They prefer any type of cover as long as it obscures the vision of predators from above.    If the Rattus norvegicus was living on a farm near animals and humans, it would stay under and/or near debris in the machine shed.  There was a study performed that tested the home range of brown rats that were in fields as compared to machine sheds.  Evidently, the conclusion was that field rats traveled much more area for living accustoms.  This can be correlated to the food supply available; brown rats could share feed with the farm animals while field animals journeyed out to suffice the demand of obtaining a meal.   In addition the survival rate was significantly better for rats who remained close to thicker areas of brush.  [8]
 [8] [8]

As seen in the picture , brown rats were placed throughout various areas on the farm.  Some were near feeders and buildings, others were out in the fields.   The top picture is representing 7 brown rats that were tagged and tracked to study the distance covered  for the preferred habitat of each individual rat.  The bottom picture represents the paths taken by 5 tagged rats while acquiring food.  This supported that any open areas were disproved by the Rattus norvegicus.  In addition, the table below is showing the results of survival for the different habitats that each trial rat was placed in.


It is clear that the survival rate was very low for the rats that inhabited cleared or open areas.  With only 8% of the tested population still living, sustainability would be difficult unless further adaptations occurred.  The protection of debris and brush assisted in that group reaching 56 %  survival; however, the fate unknown affects the results since it can't be explained.

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