Rat
Rat (genus Rattus), the
 term generally and indiscriminately applied to numerous members of 
several rodent families having bodies longer than about 12 cm, or 5 
inches. (Smaller thin-tailed rodents are just as often indiscriminately 
referred to as mice.) In scientific usage, rat  applies to any of 56 thin-tailed, medium-sized rodent species in the genus Rattus native to continental Asia and the adjacent islands of South East Asia eastward to the Australia-New Guinea region. 

 
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