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Key terms: alberta albino animals bacteria behavior best known brown rat captive cat chirping conclusion diet each other eliminated emit feeding fever genome grey hanover human population density humans infected litters mice new york new zealand norway norway rat norwegian origins parasite parts of the world perception pet plains predators province rat rat populations rattus norvegicus reptiles responsible rodent saskatchewan species spread ultrasonic vocalizations united kingdom vision Search external links cited by footnotes on Wikipedia page Brown Rat: |
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